Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc3692c8e16a0f4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 23:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b97dbc335e93f24eadae38b22d4532a7 SHA-1: 288a8affbc39aed533a027b70f1ae598146d85bc SHA-256: bbc3692c8e16a0f4436423d8475012a159eb1fb5f8965ef0a3c6dd7e30f0e402
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://monyetjoget.com/contents/files/nibirepunuwuxasafevupuruv.pdf
    • http://kedehg.com/ckfinder/userfiles/files/60190812422.pdf
    • http://benjapakee.net/UserFiles/File/rolubufavukidudiw.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/24596651310.pdf
    • https://ladangmimpi.com/contents/files/defixigajudavifiragofa.pdf
    • http://state-lithium.com/upload/files/70506447060.pdf
    • http://around-sicily.net/userfiles/file/kixudebowet.pdf
    • https://nordavril.com/userfiles/file/84616299477.pdf
    • https://meganimal.pt/site/upload/file/pavasowexul.pdf
    • http://nincity.de/inline/file/viduba.pdf
    • http://mastervin.ru/files/file/9662342519.pdf
    • http://www.leasebridge.com/CKUPimg/files/kirosinonebebixosubaxosev.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161302d421f659---mikirewedukelaku.pdf
    • http://makeyourpartnermelt.com/userfiles/file/84421257074.pdf
    • http://thebankcardservice.com/uploads/files/46615944879.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/17789992156.pdf
    • http://ituor.ir/basefile/chartermeinfo/files/toxorexubojanedomuwemafon.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161335c3100a2c---78524308523.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t8ru4hai1avl83rckfbbr24i01/jonulumalejolumisokad.pdf
    • http://www.puhito.hu/uploads/surelejexulobawagas.pdf
    • https://seger.cz/userfiles/file/vitanusasamaxivaxa.pdf
    • http://kleinschadenexpert.com/userfiles/file/15198010614.pdf
    • http://studiogiamberardino.it/userfiles/files/vugukukuzuzujod.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/jewemipoxuxutet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=8+8+y
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf9.bin
b716933edfef7e702cc844774cd000bf934a338264e3ec0ef7cae2cd377fe9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 22696 bytes
font_01_sfnt_off00011569.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 16792 bytes
font_02_sfnt_off00012d7f.bin
8491f8e49eae4daca1f2e3ecd01346e00d07dcd78d6f8a49124215b106e0afc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 9304 bytes

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