Malicious PDF — malware analysis report

Static analysis result for SHA-256 8262c979bd657b67…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 22:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd1bb62af7d8d6062ec5b58da89234fd SHA-1: 1e97feb9ce0b5db55ad29e01ea3206b714083669 SHA-256: 8262c979bd657b67815df36bc06d4a35207450c11025cfcfd4bb2a4486f5df2d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/99f12bbe01d787c76d6676cc9519ce25/xojalefujetamurejevafipup.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/wabirifajewitijobali.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/52394970092.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/bidowinozanisaduwobomeban.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ed902fcd---pirilazo.pdfIn PDF document text
    • http://e-sportis.com/images/upload/78592266697.pdfIn PDF document text
    • http://shahgrp.com/uploads/73003811226.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aced8950be---19295634300.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/lebutijafubonoluseruj.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/82434812666.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/66438706559.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16134ad5eb03dc---6954525332.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/117467940.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/namewetavivi.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/fifizixabok.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210909150920.pdfIn PDF document text
    • https://davnosti.ru/upload/patojubobavodaba.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/87659962761.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/57007498407.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/65870280664.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210912201122.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/48437403436.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/23718345474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=data+pubg+mobile+terbaruPDF link annotation
    • 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_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 18476 bytes
SHA-256: cbaf2f17ca9244ebb0ea186934cf9d3ee3e7e12e70c0385c93e2088821ed85f5
font_01_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 10564 bytes
SHA-256: 9064e2e460f7b20b3583cdbcfe6aceda197db84b9423b020ba02af8d9436bd6d
font_02_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1