Malicious PDF — malware analysis report

Static analysis result for SHA-256 465874e1b795780a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 23:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f991d8d9a83fc6354a985ab4e246debd SHA-1: 0690e9b96f881d4d7e7b498c86f1aa807f6df408 SHA-256: 465874e1b795780a044e4e1a15ce1136f5452ad957609029f5f8a905ecdb9c18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dobrasekacka.cz/userfiles/file/menide.pdf In PDF document text
    • https://jagamimpi.net/contents//files/5495055101.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/bokokanavok.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/82b232fa1229b1471f2887c709eafd99/fapasonemite.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qnejk8fptcifj38hr6e3kpe51v/75909159216.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16123425b0cf2f---gomoposinanofojigadupet.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/tatafipodasadiziferom.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8f2cc52f---59960529715.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/45969373749.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/53265600525.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/ropoxumuxom.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/7833601925.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/pupesomugazefaxowowiraf.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1746bc1de04dd9a8feb5d80da47fb34a/83595293120.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/bidikinagodozuwasixami.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/novufibetopijiribototofa.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/kujuvejomuruwopip.pdfIn PDF document text
    • http://industrialdevices.in/uploads/78628304124.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a1f3596a---98854442300.pdfIn PDF document text
    • http://debten.net/UserFiles/File/xemokifuter.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/44795572308.pdfIn PDF document text
    • https://avela.md/userfiles/file/viwamigilobefoga.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/218b3ea0812b8ca83e4106365a4a070a/vazetebiborikasomamozer.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cdf481cec3e6d32f4014958e213c4e75/56494200366.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/84074524672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=is+eating+rice+bad+for+weight+lossPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210707/16255946135336.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_off0000c1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A2 10932 bytes
SHA-256: 64ded3b4c46b70d8c44bdd9d5cb077b14ec16bc3a94a9141e530db345184622c
font_01_sfnt_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 16736 bytes
SHA-256: 381734109c32e1975c2066cb6fa13e3082f27f2a7420d99d1f34018467874ada
font_02_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1