Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1692b64747c1ced…

MALICIOUS

PDF

89.0 KB Created: 2021-07-17 06:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2393f10f8856594bbb13dd83557055a SHA-1: af0ddb6c91e2ef08a45704e4dd3031723ca63b5d SHA-256: a1692b64747c1cededdba66857c295f3b5039cfc054cc7d67a83433d324defe7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, potentially directing users to compromised WordPress sites, and contains a callback lure consistent with tech-support scams. Although no scripts were extracted, the document's structure and heuristic firings suggest it is designed to deceive users into initiating contact with an attacker.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6d1d5c8c62f2a0cbeed37a6085a043cf/60823703650.pdf In PDF document text
    • http://boathousebrokerage.com/userfiles/file/57422096758.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kibaritijiluzotesolajo.pdfIn PDF document text
    • http://patroha.hu/file/poduwed.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q96fe1lb2jjck0su2366krr8ih/pibidiwudumovin.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/nevuni.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/46188631999.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/52020730840.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ho20tj36pe46j689toq3db57u1/80764982480.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/7dffa9b681b86fced02e330dbbc5b08d/gupatasepeti.pdfIn PDF document text
    • https://seerupit.dk/assens/file/letaniwigetiwafevij.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/31345377852.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a1b582609---wekipisanifalabizebumew.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091b68a5d479---zunepitotowugejutomefoz.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609609f5ef1cd---99934204108.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/8668045681.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10e83d231c---wixogevim.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a1a99d36---27530818826.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/204f03c85ee7381dc958cb6315912009/gadazire.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e49aafdc19d---gabuveluxuxigigizurufel.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/sekelibugavufejelolofo.pdfIn PDF document text
    • https://ip-pharma.net/data/files/48361722122.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/texigokafigobidetirap.pdfIn PDF document text
    • http://serwisnawigacji.pl/userfiles/file/zuzir.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xuvunabulatigoloveb.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745543d222d---famodiranujadonimoxajon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+do+native+american+headdresses+meanPDF 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_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 17456 bytes
SHA-256: dc38b1b323e69f0c00243e48e2f8aaa63affcb36c5081a1924c7a2a465c51782
font_01_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6C 10648 bytes
SHA-256: 123fdfb62f658f40441c967b72ffb3f36d3bb120273515b6b174f9d806d172a7

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