Malicious PDF — malware analysis report

Static analysis result for SHA-256 166b86623bd02c94…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 14:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dc5db279464b7c1d8717620723dd1e2e SHA-1: acde8672884266da5f1942aa3ff4c5b5cf810fca SHA-256: 166b86623bd02c94dbedaf7ce6a653e7ea07f686f4d6e4f0444f4a7c56165716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608353325f8b5---jasezajuvitufufod.pdf In PDF document text
    • http://apvn.info/userfiles/file/24078343291.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117035e6e327---71702939039.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4ac344e21---29681402589.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210623033325_8vtutb.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/jovukemisojes.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/62f6313189c459102a20e1cbc3450074/14620258999.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba45613d83---17921664522.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/vifonemopadur.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/54408471103.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/39332041174.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jedufonotorozipeso.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8565d8bcfcd44cb16d4abfc93d2e8497/62060078317.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/91598672080.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9bc7bf2a36bb34d35cf037e3536f71d2/5377072728.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/pumesanisa.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210827201723.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/kekeluguk.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/fenav.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/xabuwa.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/ravinowojas.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/2er2moo3saqu54qjteark0lrej/31894667972.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/71847216465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=factoring+perfect+square+trinomial+worksheet+docPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 16504 bytes
SHA-256: f164c171d9f5768ffefe1fca235d58474fe40a3773235d2a440be094b17fd9ee
font_01_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 11468 bytes
SHA-256: 534d456ccbc91c5dec198ed2cad438446a184cd30dc3fb459001716c13663d7a

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