Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a00688d76b6d7e9…

MALICIOUS

PDF

112.0 KB Created: 2021-07-02 03:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b4e2ebd5e444d42b70726bdd7d6fb8c0 SHA-1: e870a4f3368b4c8fbb01a0773261cce7cd1b6260 SHA-256: 6a00688d76b6d7e9d69be03fa7262cf30bb0ee632d53f0051687b86de0f9570e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://oniceh.ru/uplcv?utm_term=confectionery+quiz+answers PDF link annotation
    • https://jackyrouxmethode.com/userfiles/file/gamisorasanemewiraw.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4f3cdc51---45703263929.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/3429934470.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/abb322a6307d1d2538dc7121ee05e6ea/bixufunowifurapujepekuke.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2cfa2f2c4---xurutukabanowedebowize.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/88052129081.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8k25lmnrkkg76s0vfcouh47cf9/vanulevuramaj.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/37176384805.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a517f72e7f2---33912979292.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/65444503618.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/nitotatomifut.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/vq92gm809qa1fiag5ktc9d8r3s/taxinifej.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/34394132551.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/10496469510.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f9dfc6f48a3e7aa0b9ecf7b2d5ad6256/mofalelej.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/bufuxatunonofufugede.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708a69789f5---vaxuregiwuxus.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a27698db716---mizemufopunog.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821afb7d698---vuwusatifur.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a0810b144b7bb5f512ed45e78a4b3068/raxosepijozibipitajawup.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/purunufobusomodagodosakoz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ie1v4ougmqp9ig78fbfmglhgrd/96671464287.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb603b412---zudotunejov.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/towaxaw.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/simojotiw.pdfIn 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://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_off00014f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16739 19200 bytes
SHA-256: 39e8aaa68034265054c9b2501ec6e59a685747ef8281059b852d4e96f8aef513
font_02_sfnt_off00019964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19964 10820 bytes
SHA-256: d39c4137b970a2fcbf231366480c75d2fa24c3d946cef6f4db814ac5cdece6d3

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