Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fca705d6e10668b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 21:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53405991e49c610e567d8e2891875696 SHA-1: 402990aaab2b77c0c5087397a74567785a7f990f SHA-256: 0fca705d6e10668b5da544c0bb20101282af27be55b3bad9aa26171eab3fb0b2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/uplcv?utm_term=calculate+your+iq PDF link annotation
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8a650bd428675f309df4316872f7087/56404714174.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/jilireduzeb.pdfIn PDF document text
    • https://mmszke.hu/files/file/45799788557.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/53233858156.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/17418970943.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/jizawurutifag.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/70mi6n4p9bsu8dl6nsdtl2sapa/96415784382.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/62uu1nsja022svtv6hb0nll1q5/42417766023.pdfIn PDF document text
    • http://tipiland.net/upload/file/61488993191.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0d73cc3f---wulebolawebi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97490da3d7c768fff73839de7204c40b/28818483401.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/94732560654.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/fukosajikovavejaf.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/16597652443.pdfIn PDF document text
    • http://iwishop.hu/file/94424051647.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a8fb7071---makumizasegonatigimo.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210611061605.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2b45e411---56108785628.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kizugewis.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/meganetewituxidiket.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/91916198932.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ed00f5023695b13fb31bff5306d2d048/rifogigamijafebotidi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC194 15808 bytes
SHA-256: 07bf29603d3b006a451393dfd0f9ca9a891523daf83ffcd4f6aa8f867ce277a6
font_01_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 10344 bytes
SHA-256: 659a4483040c45d0126a817c6d5277e20d15f2b0786cee1dd676114f9131bac9

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