Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49977e20a341c87…

MALICIOUS

PDF

69.5 KB Created: 2021-06-07 19:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 854adbab126ac01f1ad9466f95e8b124 SHA-1: 68171166f1b421634cf7300f97937c416e35b16d SHA-256: f49977e20a341c870a212914752027d5f683cf3c986741f61ae701488b1bcf1e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=how+do+you+dispose+of+a+hot+water+tank PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/214ea7ba5bdc82e4b8fe6cd7e40f3aae/mawosowufudatupitesabovub.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/23ul7egsrhunirsjsno8o42sae/75300558708.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/dc8647cf0c3a4393c629be5574709c0e/gujifapapobepefufobebumot.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/xuvenozuta.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ecdhug3daqfk4ps2sna9n5hsd3/domapadam.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/zeminugutapofovelesu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082744204d8d---pilotizizaxidasid.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2ede882d---27969700521.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/13956999029.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/b06c31446e9987daed3a7c4df381048e/xamukeniwo.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/05bb8374c7fb6d24e5fa886e99224a30/loxip.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f5c840950---winidu.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/vosulevewijivot.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/onr0n7fj8alb3c2qtfu395leoj/rufazoxit.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160725da622fa7---45956457095.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a75818f9d---pixawurasenalatipuzupel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 5316 bytes
SHA-256: 2c341f7f49c5edea355cd0e54d78ad5efa857ad145bd137012bff1e01910204a
font_01_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 10608 bytes
SHA-256: ba4306c4fed6ec23504954349ccda9ae5f22c6cd5d6615b6d259e70abee0e232