Malicious PDF — malware analysis report

Static analysis result for SHA-256 2803a2c389f1ff49…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 13:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35d060a7aa836e5f2f04002e0405ff6f SHA-1: a78a61fe0df84c6c74d596ca050b65352d5e62d5 SHA-256: 2803a2c389f1ff49870cf24b83297377d511b83a1847de5e9ed4c3837e8bd407
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 sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5n1l9skdnjos7gvdflo1bhrst3/garezazovugajukipugupim.pdf In PDF document text
    • http://magooferta.pl/uploads/fck/file/47538594749.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/779bd668bb3196d69e833351d10af9f7/lemubote.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e06773eb---5650272722.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c66ea383---vonagaxuwumifuwemotalizo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/36708653269.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/73630268474.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/2f55ec302433737e32e940fbe49faa90/roxujoxununavijoseniputa.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a199b2819ef9d45478b5ace527620403/lubewodefowajuxakevawutig.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f29241d1a272d8fc38197689921e3e1d/47323572451.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/komevemubapozosurul.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6164d2cb6c2bd6eb123322c47461793e/tagobalonajuvetekugemod.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e33460d8---favasepuwenokiju.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fg9kqj0td66b29h55a69nthgj5/95834300800.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e2e3eb49acc170ac9c9ce5be1b475d17/60602911409.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/450bb2006fc62a78dee2922e9a5b3c0d/penivuzupelajop.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a44951db72c---81186307233.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e45fcab994---68807765846.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/texamepuwuvinigar.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a0db06b8---57183903204.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219c7b6bfe---paduwelubemej.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c29bd84670f---tiwuguwaxaw.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/97284964810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=michael+bolton+lean+on+me+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 10588 bytes
SHA-256: 879720e707b6ff0ee54417e8ece86fd602683736981b3ef75e7817e21e88f104
font_01_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 17888 bytes
SHA-256: eb8285ce952b4f006521b7b3593663437689faf4aec724aca9ca85fc5cc65715
font_03_sfnt_off000136de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_04_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 16340 bytes
SHA-256: 5ca0f057fbf63f5682e7944538b20cd34cad7b03a9ae8dd6a9e175cb923574e4

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