Malicious PDF — malware analysis report

Static analysis result for SHA-256 156e7683987b52a9…

MALICIOUS

PDF

103.7 KB Created: 2021-06-30 04:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 56da15534f3d4f42c0405282d63914e6 SHA-1: 99bfba638b5129d2cd9adbf7fa91294be76c27f4 SHA-256: 156e7683987b52a930082001db9a8bb61966f2db65c8739e479f55b03ba270c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the primary attack pattern involves redirecting users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://archism.ru/uplcv?utm_term=32+boobs+size+pic PDF link annotation
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e16de9ba9---87330189110.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/46354791784.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ea320f02c53cf8e3d07cf32f83513259/govezabobidadamabasexowo.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/papomudolovukoravipuwapa.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/26062583635.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081151666a5e---91075382270.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/53768442113.pdfIn PDF document text
    • https://cartolmania.it/file/62737081668.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/14475495543.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7d3a055f---dupatusoxitobivujatagox.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c89bcd64d---zigizederevegoxawiz.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b2eae0c987694965fb636b0e8998be0b/rojunetig.pdfIn PDF document text
    • https://0900107678.com/upload/file/limafaduw.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/1683260021.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d0054c1204703ce5ff6e911465cbe81f/begenibul.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/75740388538.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/87931041782.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a260de4e01f---sinoxinireripubinopavor.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/91065169802.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9d317b462---27798519314.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/86536419077.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7c68ec8f3323872c449a19a014229f60/zojadetiburuzaxupoj.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3e5pajemi663sb7pqmvttbravh/gowekemadilewejitux.pdfIn PDF document text
    • https://rajaunited.com/contents//files/kapinineweza.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001356e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356E 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00014aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEE 10252 bytes
SHA-256: 7c4d823d69d44a8d3d88c90f03e403197c664e44d7bf67177c6543533e9ba439
font_03_sfnt_off000161f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F5 17848 bytes
SHA-256: 367a652afb3469f51d0a86d75da6b96b7b4492114534dd52adf44e4fa8381656

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