Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da6c5f6cce7339b…

MALICIOUS

PDF

82.9 KB Created: 2021-06-27 22:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40f5d5c8a3001902c8738f813a73f031 SHA-1: d40420685b7b307aff54f428104f50e3491ce661 SHA-256: 3da6c5f6cce7339bff702de00b43db74c9a7ebae534b4a34af0aecf7c37bf5c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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, suggesting a phishing or redirection attempt. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/286148f0ba064230951b27b8aa16304d/12833051211.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e63a48245---vipemugujos.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160909bfc3c9d1---movujowepok.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/94794207396.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f25342def---vonisanoborufafaduk.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4b615a98---20983372632.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abce3cb5410---10585599189.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4b6114f60bc3f5bd8c4057acb7cf1aea/70060809309.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec9f09b8a---80217071583.pdf
    • http://savaksangida.com/resimler/files/7390343007.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94ca1e14a---jobijazi.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160769e30e2037---junun.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4rlvdkaspo8smvajcs9jke425l/jezamikug.pdf
    • https://icbacademy.com/upload/files/debefagefudele.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/8753459360.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/225fcf1643882a58a00ce2519d94ee9a/rilojutavow.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d539643d---kuputu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10aa723e8b---vatavomota.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bfde190b3---jegamax.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hubdq446l8gfpsqhc7lbnsd840/balap.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e56043721---80597078833.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0a9dc3ac7f1d4d775b0d4075a2c88d9f/50543588267.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6f0805a99b582b442fd218184e77afa1/rovezaxem.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082775c6d270---tejiki.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/abe3ade0de3b0755544013704b46c299/tovoregopemitenu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+ntp+server+to+use
    • 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_off0000e2e1.bin
404a18e0fa1f9803ae870c5c84de5c705c6ff52132db85aecd12606bb1160f68
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 10164 bytes
font_01_sfnt_off0000f9d2.bin
f345b71de3a7a0d05458097571a52cc5da7e8b03db46cb8f5fe8235a3f08633e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 17052 bytes
font_02_sfnt_off0001265d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 16792 bytes