Malicious PDF — malware analysis report

Static analysis result for SHA-256 c737a82482ac5401…

MALICIOUS

PDF

97.0 KB Created: 2021-07-02 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41804001a4e56d29a70a0ebe9e923610 SHA-1: a0952d7e981d3abe7a4e5250626cb676c17f54d4 SHA-256: c737a82482ac5401d2c544cc1d7d748d42067d43d85cbcb8c7a88d0fb57b0510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no executable scripts were extracted, the presence of numerous links to potentially malicious content suggests a phishing or redirection attack. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • 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.
  • 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 http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160858fe200e46---sisapepa.pdf In PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee96042fe---todosamunovowik.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/webofoje.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/28647935063.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8ua3nfqsid4i2ic7490bbld14c/11025097068.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3dbedcb7---95950642914.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d06dcfa90---83765177219.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/18360022105.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/43398930767.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kowapenonab.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f312c9172d---84515904991.pdfIn PDF document text
    • https://ovalpolycoats.com/media/xupagafuribugegakat.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/rebupatidoxerevug.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/41754917331.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad334d9e9---38136084996.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc57c61fef---93549667216.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a7ae823d724b6b082834f55da5c2de9/48978741064.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/65818700544.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/70099498992.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2dfsh8cvlc7uk13g16ng2ar76f/sakubabaxuzupipolumis.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/datinasone.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa1a961a15---63737675508.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4707d172c---xuzarujemepemomewide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=room+in+rome+ytsPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC62 16852 bytes
SHA-256: 5b2c97c6fbc72acc5b61db8786e2b38c15a4f87ae3ef851e172ed6df882e5e52
font_01_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 34812 bytes
SHA-256: d4eadf7034b132d59c291b61e35753e1f708668d7184c1de7fc2060a9fbb7c16
font_02_sfnt_off00014769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14769 10220 bytes
SHA-256: 2f3631c469707be4a9b5b1f884436b15edb52dc19f4596446695dd258546aeea
font_03_sfnt_off00015e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1