Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5332d154001348…

MALICIOUS

PDF

89.6 KB Created: 2021-09-03 06:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78b988c446c625698865ad227443ffa6 SHA-1: a840933676a955dfb36b7e2992f6b77eb8855534 SHA-256: 3a5332d154001348b2f1fb17b068f58104a3c44696cbc2aa78d11f5743ee8022
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for SEO manipulation or to serve further malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/d3e455795b0079dfc134ad566fd4b8fd/5515179558.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vnf1tdvgjt4od9c3vj6opgo4e1/42203076690.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210520115440.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/tonowotekawoluno.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jujozajimitan.pdfIn PDF document text
    • http://polipack.ru/content/file/niradume.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/fetulagafezixokogixilum.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/55753158445.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/73032914509.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/luvufp1mlfb6qa1eveqbaushqk/50657926237.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dp4b97culq2hnmav4ocjdh4se5/vawazazaxava.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3b5254f0739d1805b377c10c53f3c83f/latadilebu.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/puvevit.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/507198596.pdfIn PDF document text
    • https://castel.ro/userfiles/file/60522605551.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/1c1resm2ddjbb3oiumfbrdvk8q/femamuk.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/laxufo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d091b4d6542---69114456784.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dcc8d90673f69a67c5df08aea30831f2/52208612193.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980b72c5ee---21153983777.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0642268979045e77629e7bf0d9313a32/xivafejojubabaxasazu.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/71661089187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=prefixes+and+suffixes+worksheets+grade+4PDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 11048 bytes
SHA-256: 1a3731494dd63d6fbe290addd7bd07edc4c0526b0dd3a74b5d4686ad4e9aa06f
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 18208 bytes
SHA-256: bb64cef25bbc5a7cef8f2675c717e4b00a994ad5f8e38f04ec01c4c41f5515dd

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