Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b6606154bf5d5a…

MALICIOUS

PDF

77.2 KB Created: 2021-06-20 23:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9dda858f1c2ad28ef4967e51c4c7b191 SHA-1: aab9123bef7437c24d7bffbb4f0df93b3757861c SHA-256: 31b6606154bf5d5ad8c1663af3b74c4256ea5714c041fb906a51959bf3c7824c
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to download and execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=acpi+atk0110+windows+7+32+bit PDF link annotation
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106152057211316.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc54b1dde5---81152267090.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/zoxonupilusesipom.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/tenisudubij.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/22872223045.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/sunomejite.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/81387004027.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/folozemewekak.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bed7ebfe0988087a84265df72451c29d/wurogufebumesa.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/zizososelajap.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce40ce71d---90906260247.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bc529c3a2eca618423daf5cb8c588268/34460367529.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b374bbd910b---91869087374.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b9j97najldb2kec4v7jrrjhj4p/10950297803.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/gubotixaviwa.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/24003145686.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae013916a4e---sosofobizekozubepefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 5464 bytes
SHA-256: 5955dd6475023ebe533b96f2462ada4ae90febe9ae3af72eea4245c2249b93f2
font_01_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 16700 bytes
SHA-256: 0c015ef9fe1002ab88b4fa1fed530e45fb491e49501ffd230aae23db517dcf63
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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