Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be59cf42960ec47…

MALICIOUS

PDF

83.0 KB Created: 2021-06-29 03:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ed6e38cf4e0570c7c2fda60daf84332 SHA-1: 3a868fc2e138dd82ae982786179d4b8f83bd4579 SHA-256: 5be59cf42960ec472ec33d91c4a2a2d302734751cf204badcda9889dcbee1073
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, often using UTM parameters to track clicks for software downloads like 'ms office 2016 torrent'. This suggests a phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=ms+office+2016+torrent PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7acfd9d6d---sigalufopanibomawumudo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbb07fab1---pesaxajubuma.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a5d7413ec379b6e11baa9e4ad5088be4/razuwovoxabavalox.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d611a50260---botizalokanukapowejesepos.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609061ebcb36a---wusibevija.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe5f99dfb---bogarerobupomave.pdfPDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1ea2643a0d6a1583b4892c68d270e3b3/mufifoporaral.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cijprr30le87mjemcsqk8hsmsn/29660016348.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/30700332497.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/10b77e361b60e7feeea5238f42c586cf/89702939270.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/814h3imic18dnu4o0krbt59tb7/42362639858.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/142012245294.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dd988a4f---62856606559.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b8624aea4d6894eb2101e5f296219c38/vipawuwosup.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ead55499---70651019900.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/830b1viu6cdd2pkcahk6jifm62/12299240078.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/fulakega.pdfIn PDF document text
    • http://www.siposferenc.hu/html/446802237.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fg2m6qvli6temmr1pkt10c1o67/komimof.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c4f204dfacb9222f331c8739184fbb00/46145741931.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/16154420519.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jujaxazuj.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/mibawoxorij.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/fazutexezogeriginojoxopu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/51aeeea15acb82d4493ec9fb67a0a4d6/xareko.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/vaneseb.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1b073fdb---14488714737.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e8649b19---zazusepujiraf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 17504 bytes
SHA-256: 2d578ce74cd7fec1745dcaea42136844813c6fe6d938ce2c462e4e1e6d1546b9
font_01_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 10576 bytes
SHA-256: 157fe10bdb841cc2acab11647810ea7f33ebff858ad302bda0d29300129ba25e