Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4e6b4d44c6da69…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 08:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19575ccc227add523249fb6c4bc8fb2a SHA-1: 3c0eda5712068aac6803a51bedc00563d4af5422 SHA-256: af4e6b4d44c6da69c1f1a1e2df2d664476fbfc72a80c76ea27892c79ff4a7c18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=what+is+ethics+in+social+science
    • http://ji-tien.com/userfiles/file/43362833819.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/14221496785.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffd536eef4---dimeworupumijop.pdf
    • http://targdenunti.ro/userfiles/file/65539734322.pdf
    • http://bishnutoursandtravels.in/userfiles/file/20781524178.pdf
    • http://doktor-okonski.pl/uploadimg/file/poteka.pdf
    • https://aquatrustfina.com/userfiles/file/kadotavivibodoke.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1e22fa48da79d4b22f4067062dd6eb8a/wagazixifezite.pdf
    • https://artlabjo.com/userfiles/file/38989127817.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95105c4f0---gifowire.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d6e7f162b8a58aeffc83248ec9c38a8d/zafewobozozuwokepu.pdf
    • http://mgocsm.in/userfiles/file/10503334522.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7161270247---81131626537.pdf
    • http://alibabashipping.com/userfiles/file/xamemizenoxow.pdf
    • http://goref.ru/files/file/xuluse.pdf
    • http://hzjksj.com/images/upload/File/fonamijepawukevovubukux.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0066c4ce4b74167c78ea41a192bcf86f/tuxokev.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a98527c13d4df774eff4730f1404488c/taxagijuwugowubixozera.pdf
    • http://barudan.hk/UploadFile/file/20210627160702875.pdf
    • http://jcon-aps.dk/userfiles/file/kudikeradegi.pdf
    • http://cokhibaosang.com/media/ftp/file/63188782232.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e0e166c7---didojuwamisemetadudeku.pdf
    • https://cissud.com/uploads/ck_editor/files/logen.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/majufuxu.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857def18fd---natuvozafeb.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7c1e563dd---48808277053.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e2.bin
6e40b91d8939fd50c49b639e5ee76689ac2b71ad10f3fe558ad38da8fa7aa70e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 16504 bytes
font_01_sfnt_off00011b67.bin
7e2d4458d9d67611352a517f413f14f5bc0b65695d5c5274b710f89a6877698f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 10220 bytes
font_02_sfnt_off0001324f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 16792 bytes