Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4176e93b3e619a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 06:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc2cb151bcc7a5f806f2edae4818930b SHA-1: 2832fee592d7d1162ce0eb269fe9828eee7f55d6 SHA-256: 8d4176e93b3e619a63b42e28bfb022dbab893596b8c9541542beac7f9bfeb152
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=iphone+11+pro+price+in+bangladesh+unofficial PDF link annotation
    • http://pawsandtiaras.com/ckfinder/userfiles/files/70116374191.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/58476378305.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/wegijisawezowikizininuvav.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/gupivememibuxupofabigisab.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/53651437240.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/87203648643.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133db795f732---rozewesosim.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa59d818d---buwakaperutofozoxak.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/liwejiloju.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/88079632853.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/1813570021.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/pekukugema.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/51035759874.pdfIn PDF document text
    • https://successalpha.team/upload/files/61859388567.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/nivinoxilifojeril.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/8571161577.pdfIn PDF document text
    • http://iscelenie.info/files/file/kumozasuzumipemawu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kuxefuvivovetokizopawes.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/66bddef33bf4740c8a4ebf0f14a29d6a/wijozutobut.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/48cf4c2635dcf950f2cd86d5042e4329/tiborijirova.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fimazegapusana.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/82918998187.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/bolikuv.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/naxuwipumokuvilewo.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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 18396 bytes
SHA-256: ee3bca0a8a68857023c0e225672583fd366e89472727840e8ea7c75c574f3cd5
font_02_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 11044 bytes
SHA-256: 41831ba0814bf54a133d82571e0d05e8413ee0beb42376aec52b41d9a7d4d5f0

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