Malicious PDF — malware analysis report

Static analysis result for SHA-256 9696bf3e6872f15b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 10:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34ae6015e1a79a023c191b6abae1f9bc SHA-1: 43c56a37f337ff4fe8efe582a1bbe0a5f525d792 SHA-256: 9696bf3e6872f15b2714cc7e8797dea43b37a49edf45855eb81fe9aba1f1904b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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://krisoc.ru/uplcv?utm_term=sigma+and+pi+bonds+in+triple+bond PDF link annotation
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614234e919fe2---67118741955.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/50417487300.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/98908427510.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/17391360084.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210911011329.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/93af42f2162f76c6fc410026319b8353/20074621597.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/telusarasumamewom.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/44406741290.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/1898913202.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/gupolezinaregelenadexelub.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97df682ec---63350788787.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/gotikaw.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/72401387221.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/72944294562.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136324f0378e---93873971523.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/13718702312.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/fakavosu.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vonefoxitaduvodo.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/30338065359.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/tagixiveno.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/51004099580.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0d68656185835d250d79cb9f7761a81d/gomosibitunorajumanodum.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/39767880505.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/35131844377.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/jepazisoponejas.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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 10948 bytes
SHA-256: d14791467723225c739b0e8127fb3fd6405c2ce8aee648da5f37fa16a1aa3511
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 18732 bytes
SHA-256: 9f582a03c03c3250a07f0e795c2869d2478d07efac39f8f4868520e5dffbeae3

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