Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fc9e84f7bc7514…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 19:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac396a74b944eb8ae23e03d8bd6eef1b SHA-1: c796ddb37337de7cdb3b2cd4cdea5651d033057f SHA-256: f3fc9e84f7bc7514eb5e632e564307cdcb552f7a4bec0e917cf2733b120c3b3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure or a downloader for a second-stage payload.

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://allytemp.ru/uplcv?utm_term=veeramachaneni+diabetes+diet+plan+pdf PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613037144161e---xojoro.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/bazezem.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f9748301b67d18153178b05b8852d4c2/nodafopi.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/80872543293.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/5422129449.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/wapuruporidalatumuxapenen.pdfIn PDF document text
    • http://capital96.com/userfiles/file/45562262403.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/69376358151.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eececada6---tutibezozivitozekadudazon.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/mekowedaf.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/11930455461.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac311c95488---42499828396.pdfIn PDF document text
    • http://stattus.com/assets/file/mumixeki.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///1331585767.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t2uusrh78h9ltbs5vmqi79nbn5/zexumi.pdfIn PDF document text
    • http://orenprom.com/img/account/file/69640257989.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/40869951320.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b3b095ee---69610257504.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/91735441588.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed77919369---27367868378.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/49890889869.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/76599331044.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/61900738709.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/kusoguz.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_off0000b934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 17372 bytes
SHA-256: 07a22099f0130e75affa43a812d5bfd748746d353d9585bf9125803d8d69f691
font_02_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10876 bytes
SHA-256: 06b8fdb6f4ffc5181dd240016b047c32e2bd4941959e7a8e53485daaa80c0d80

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