Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3ccd4256e96632…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 07:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff2fa2df0d7887ae648c63295aec0032 SHA-1: 6e492ccdc9c167f42ceda1c89aa4526f7774b53c SHA-256: cb3ccd4256e96632d37166a5c16f6e40292566e87a6142cdb22da263af333ee0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery attempt. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content. The presence of a 'Callback phishing phone lure' heuristic further supports the conclusion that the document is designed to trick users into initiating contact for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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://pixomot.ru/uplcv?utm_term=boss+gt+10b+manual PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd2944f2c---71984341791.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fd016daa---45316556350.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ade7eb44ea0851db683fba652d10502c/24767352921.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/jopevoviroxolo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nitinomulajakezipoxis.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/gisajawulatozotefegavunir.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/fofewivitokujid.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7941a2ae3---jubirogedadifabowo.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/wubesudabadufaniforapebu.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/40998545313.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd319ce6e0---tusupuxaxogarapore.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kiwulotosefufole.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/3d4fjjpus1t93m24pocoi4dtn4/wigekajatatu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0953a494---tuzimugi.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/24531427774.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e53bd2bed---46884579007.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/68322647611.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098983e49c40---donaxug.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/m1fcjhnhophrpg5vrih694mpq2/gonufufomudinimixure.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4badhrffbm3rhud6jis5ug6a5n/bonuzitatojezad.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/dosasapaxazuteginetan.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609695e4d634a---kiwuwaligivajek.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b9d1929ed63e90bc8bf5fdd99985b8cf/19205110880.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/4878351774.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/rorufogabosaxi.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/vovoponus.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_off0000cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 10592 bytes
SHA-256: 8ac227049ec175b65d8b05680ae46c1a32cb2920f17afc8c82a8297adcd23bd3
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 17380 bytes
SHA-256: 059c6fb10a25c74066c41ec55e922d22d752c69ecbcaae19d3d43daa8af7f783
font_02_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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