Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28fc2756eacc590…

MALICIOUS

PDF

90.2 KB Created: 2021-06-09 02:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd9dc1ce2d67ce972aa1dcec8bfadd65 SHA-1: 2f0173a5906065ac8f5a2ba90543037087808591 SHA-256: d28fc2756eacc590963827c7490c41500da0103b2e7c8b4ae3d06f7363400f48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=ha+ho+gayi+galti+mujhse+song+lyrics PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b3be658206b61cb2f5c56db88d4d0c56/fivejirokalasabiroser.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/85218fcf0925489758dc065bb245dcb9/16018849021.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa78197b743---85675653976.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/03daibj9j3r40jlfqlkbkgoqhh/vuwaxuwizax.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160808a37475b4---99220403490.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f534f18e---rigasagavirisonojeki.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/34b1b12d8858fca59f98f70f15d3863e/xapitavojiziriroxe.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4b750e66---mudemewadapelimurolew.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/mli95g0vqsej1dg2h4joheeh87/jexexudenabobutarokag.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/46293152036.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ab7fef34a---57586970804.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbd4b2113---87035339410.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c989189d6e---tebemav.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/lewiborepulobe.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe94c6a5b---51706845009.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/135a3a9f92cbd54a1e256d8c050bfb14/jekasevow.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60249e1ece---rebowovetutitos.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fikigotejisesosejunefuwin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 3736 bytes
SHA-256: e3cd73e93ba84fede4bc8926944b2cedaec611b7bbb56872608c4b3a529042cd
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 5232 bytes
SHA-256: 33c179702de375d0757829424d4f2f4856aa67f0571bec3656265ee6fc93f5d8
font_02_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 12240 bytes
SHA-256: a2d9b27f7033858c6800658e07033c8b4c8d88281a67bf9ca38405b3187198ec
font_03_sfnt_off00013f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F68 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_04_sfnt_off00014d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D68 3180 bytes
SHA-256: 81c9e4927c11805798f8454928ff7044b038ce031ea7af29bbe600ccb4ebb61d

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