Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f1c7af2bf7626c…

MALICIOUS

PDF

93.8 KB Created: 2021-07-18 03:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17955f7b6fab7f49a2744ccdd435f682 SHA-1: b9c656a75b4793383c16caecc05ef7b5bc5976f8 SHA-256: a8f1c7af2bf7626c98687f5e14aaf42ef6163b191083b9d121891b03f7ce4af1
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to distribute further malicious content or phish users. The PDF structure and link farm characteristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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 http://acecaalcoy.com/userfiles/file/57363384045.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/zipigufela.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b7d0f4f57baaa4d881186ffd48a61b11/fisom.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcda86971---joteposozevuw.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/40013046516.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/rapozidetevugavale.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fnbe7po166viiu5rtcde703ka5/wufinijelazudukutobuziga.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/e1fec814e5aa4e2b092d28cf2275291f/17943390574.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/eaa7a4cea3c8e69952ef619e31621d69/kujotegonafafofa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1acb2b11---47290050710.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/88017192614.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2560554508bbfb02a39e13839284bda0/78133787923.pdfIn PDF document text
    • https://digireg.gr/upload/19611573407.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811010306ac---sofupufenipexanewituzinon.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/c4sua0mc9g9naupm8fnodvts65/gowunuzenez.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/levabibudoguzemewesabalo.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xafutomipiwuliduzumu.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/gilafemupotubilevovitone.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pgb7oj4ulpvnm1p7h3rbgnfb6u/vuwovuvevideratalobixek.pdfIn PDF document text
    • https://latework.cz/soubory/91270666522.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/25v2k1lrudnma9birai26sl7q8/gafifupibi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071223ddaa33---peparikosuxadipaz.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/diratolomero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=brownie+recipe+for+air+fryerPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 18456 bytes
SHA-256: 365023a838688dc7e7166cf5badb08dc554264edc012b9ff7dc60e8263e16e4b
font_01_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 16396 bytes
SHA-256: 45647295bf3e6975917d2c46c854a2f040b6d2f4fa9dfc4d8f9276b78401693b
font_03_sfnt_off000151bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BB 10416 bytes
SHA-256: b2a4df3667902ca6851ee6197681a3cec40466b84ae90643ac65c0bc6c8901e4

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