Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6a67da79f63d41…

MALICIOUS

PDF

114.1 KB Created: 2021-06-29 19:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0c5cf7b19b16c3beb7589e9371a7e20f SHA-1: 3c516f0d523f37f03de11a56edf4f748aca0d5ce SHA-256: 2a6a67da79f63d41ef074ea41a2a42d4270a2168b6c9be42f7bc3f6894b13ad5
156 Risk Score

Malware Insights

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

The 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 websites, many of which host further PDF files. This suggests a phishing or malware distribution campaign leveraging compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/u3ak2d9tunbn3mqj2397g1ed9d/73351624176.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99cdef084---bisologas.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940c8590104---52337295405.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c1fb46d91f318e3bcf86c2de764535d4/46657011984.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ad4a7e0f---sedorutamogazuk.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083b499b12f4---8073511199.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/bomelonavafataraganul.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b47f1c241---16830360147.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f1dd13d41d6f111d66ac594aec28e518/27738418765.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/vevixirixaruzeg.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/81318604817.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/43649845830.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/90296416943.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/gesosazuweladimofuvitas.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f83e902a1b1de6c15560ff51d6251b8c/takewiwipirinidugugefiju.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94a70627f---vufaresu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905c40eeb30---datipaxu.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/pifit.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/22108576358.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d191c584c523ae673c77e66b590fb7c4/gunaxoxomofulama.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5jm0uj2rkps2cnq1eq9bd602uf/wojesavevulipofoweliluven.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zuzowa.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/59686183955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=why+is+it+said+that+air+is+a+homogeneous+mixture+of+various+gasesPDF 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_off0001539f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539F 11132 bytes
SHA-256: abd3ac68926515fe7ffd6e675656b62052f2fd31bde4a03e20f29b127deaa866
font_01_sfnt_off00016d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D46 19916 bytes
SHA-256: 1f3282ee1decc44fc29294b05aed3bb0a1dd7934120d1aa6c23296c3dcf3e1af
font_02_sfnt_off0001a257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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