Malicious PDF — malware analysis report

Static analysis result for SHA-256 338b0cd9c573bd28…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 18:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 563727846390b2035d82d40cc91f382e SHA-1: 00d5944294b87e11fc7ecc573f7ee488464b554f SHA-256: 338b0cd9c573bd28bea77e9fe540b744b9c4fdb53ee250423627583ae6812f7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The PDF's structure and numerous external links are consistent with a malicious document designed to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fff088409---40261561738.pdf In PDF document text
    • http://didongsinhvien.com/upload/files/vipikevutogaliz.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/97922272853.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rkj7hfcjb40n4cb3vv2gfj3qlu/99793147318.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/45834152787.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/sokofazotekadixefo.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/26939402169.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/69916180142.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3bcb0ebe9e37d5fbcfd31baad637a4c/tekojusozes.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/nisasasovimoxifofovuro.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/muvoxoxapomit.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/40719376440.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdeaca655c---65829344627.pdfIn PDF document text
    • http://wami.cc/data/files/32383803480.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d9a5e285f7f1c697c3dbbc900c952026/40563841898.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/kapadumonebepojo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b735e5e818---27755628976.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/mofazavigapuve.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631923512.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gukafal.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/xatofajoxavanuzanisuvaj.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/gagefunilipuku.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ec283125400ffde9d70126fdb6d75392/fefibezomo.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/66131464568.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/49720430577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pc+pokemon+go+spooferPDF 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_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 18304 bytes
SHA-256: 86249c4cec9bc02acd6e0a0437c8be08ea93e99fff7112c4832259149765d043
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 10520 bytes
SHA-256: 764e55b74458e944cf6a2c6b312d04f80f6aee802478a5874e984d86d3478777