Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0aa4f44a12017c…

MALICIOUS

PDF

89.2 KB Created: 2021-07-13 02:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a632a6fd9816727f50159a56ee45e9bc SHA-1: b885c82602a063431b37fd0e31c14cbe3a0a2d54 SHA-256: 8c0aa4f44a12017c61453c361e24758cddb3b8ad56cff864fc6a781a57225880
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 leading to further malicious content or phishing sites. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to prompt the user to make a phone call, consistent with callback phishing or tech-support scam tactics.

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) or Microsoft license-boilerplate 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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3043993c3b8d01b13b4fb066cf08f3a4/remetuwabatizilenekov.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096dda3951f3---kakuvaje.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2cd73143---35337616414.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/70d1add5d5f38041146aabf6a04dffc0/19484869717.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de458c0ad2---38307569164.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/14695471511.pdfIn PDF document text
    • http://nepalmicrofinancesummit.org/userfiles/files/60152951301.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/saxaja.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/23460786348.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/33135514405.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/08ec6c08df4d2bb8b34f624c2f5aa8cd/99854586248.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tbnj4l9ivnit7i162l90s145f3/wejiduzivoxoneli.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160892d001ce9c---kubavavefunonafuzu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbd5a1212---guvopekinamelaba.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hlo99mtqg2uqjnb3d7f4qtel0b/vikegiwujatigin.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0e692fc4---roladokilizoda.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/wefifefekeje.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/81217908132.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/repanifuwoxowibirewomifo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/duzanodutizetex.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210704_27A3421DF51D5E58.pdfIn PDF document text
    • https://go2germany.ru/files/file/nelevutiwewojef.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/89301173544.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a997f0cb5be---40775424480.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c71201495fe---runamuzukureras.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52b185ee75---65848320950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=commodity+code+hs+codePDF 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

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_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 17348 bytes
SHA-256: e26d2ffeca3e614faa9702b3cb07ada359a22e915527e4272c588b49f0d70713
font_02_sfnt_off0001402e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402E 10368 bytes
SHA-256: 3f70dfd200a08249792ac4ee582dd6b3b398a91db46f77b07a5dce4f69b6dc23

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