Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a636e0fe238acba…

MALICIOUS

PDF

106.0 KB Created: 2021-07-24 17:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9121d13b4bf0818666cf4d1189fb829 SHA-1: 959a265859b91c33b6c6608c2413f8f937e840ac SHA-256: 6a636e0fe238acbadbb4fbd3362ae2f090c473e34b3364b001a552364140dc87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/63e852129e310e2fa0e3e2d4df76041b/woroxubivu.pdf In PDF document text
    • https://silga.ca/userfiles/file/fibelenunurul.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcb97e5c0d---javosagiwebipozisatapar.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/dulasinodi.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210607071531_kc8gnk.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23d1c8cde---24052865327.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/veminalupatu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b090d1e8205---85593762635.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/32291710383.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u61a44jmnuv6bcdn8pf7hbeajn/16054531862.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/50a8cfd1cc43f1a57ef74bbcad372c66/ludatetiriragibodufof.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/814454f7cb0c6d41fc95bd4f2ec5993c/57968568241.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca89a557b---badoxonejovojavirowe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2ac8dae9f---17579537147.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/sovoxelofugoguwezebokiw.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/60378955196.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/fefezegigefodenebeturekof.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/752bbc7a59e86f27f5675ad5eccf2753/33323985900.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc59a9afc7---20113821424.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade503a5d---zudagejesak.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/27219572041.pdfIn PDF document text
    • https://kawanmto.com/contents//files/13874388854.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/6df076d5b5d1a98134fe31dfb0b730e6/gutesapaxorojedokaj.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809362a530f---27745985373.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dcff2b5d---98070720561.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/jijarunag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+turn+dna+to+mrnaPDF 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_off00013a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000152a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A4 10148 bytes
SHA-256: b14f568f40bead62e6c6dfc717f35976bb85f6adb793670e889a4fc7d0631a5f
font_02_sfnt_off00016946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16946 18428 bytes
SHA-256: 296a6a415c91bf90178e55fb0bf4739cdb3d842625940864718c9d6bff93a469