Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b925473782c964…

MALICIOUS

PDF

94.8 KB Created: 2021-09-06 14:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec4bce2f4ba2f93524f885af54e0ab3f SHA-1: 090b99b219d80eaeaf9451564e19fef01950c865 SHA-256: 72b925473782c96474bb087cc9a554b33a1358f5e94b83b5f3abc81d4ad1ddfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c1cbb4c7fe5f618e382da683f7896eda/suvisuwigoba.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160863b9a70cf9---bikigitepalori.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ebec40ad---60019112947.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb2e1346d---zobufufa.pdfIn PDF document text
    • https://anfauglir.com/images/file/febowowiralo.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/87191183324.pdfIn PDF document text
    • http://polipack.ru/content/file/18656383332.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/79646376316.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/zeluj.pdfIn PDF document text
    • http://abc-tel.ru/data/File/nagulegaribe.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xogonajuwisojinojame.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24613a1ddd---jibigosununowuzutasij.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///xusomunikokitufusi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612677f43e5b9---bituduxikelun.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8tp0rju49upnslt8aotr3h1ue2/denope.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/94839524105.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/48517539327.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/jegikomemixigufe.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/rumako.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39aad276f---luvaronega.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kixaxi.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073a982c5589---90097792652.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160becc487739d---77378232715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=riesgo+infecto-biologico+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 18756 bytes
SHA-256: 927c6dd6f975e9bbb2b8b665e25d5eb18818f8eefc1ca7a9e2f48b3f5ce2ff0e
font_01_sfnt_off00013d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D19 10752 bytes
SHA-256: a5db03066d2774dd9970861ddeb8917527f892021af80f7d424c2d878263f5c0
font_02_sfnt_off00015591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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