Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb501587c90a0e5…

MALICIOUS

PDF

74.6 KB Created: 2021-08-16 10:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 73ba8c7f20df7faa667c00b7efc5829b SHA-1: f5ed833a83ce2a0a43eb526fb7db7220c8dfc153 SHA-256: fbb501587c90a0e504f602a03ed2651d90f7bbf57dca9c5a8516d29a43d959f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a21137523---41397586721.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d87837c---gekemopapap.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ueurp2tfbemvap6edpeafpi173/18796557722.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ba70a97d700cafa8ec86b7d419ce763d/74373031045.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/14476013442.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/kobiremefurekufodafavo.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/61007359725.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/28736811951.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/74162246564.pdfIn PDF document text
    • https://network-italia.com/file/82486879735.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/26673498331.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/64040868352.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/95639126784.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/nagesesipi.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/67206853947.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/lawunaluxoki.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/bifefixobiwiwuxitizu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/verev.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/de04b38c7b92d1e95645f6e5e32671ee/diruna.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/savafopomadal.pdfIn PDF document text
    • https://curvy.tw/upload/files/buzufuzisovamijibixaweg.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea9f250289---38639725101.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610634cb8adc9---fosonodo.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2142f3dd6f---warer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gayatri+mantra+anuradha+paudwal+free+download+mp3PDF 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_off0000bfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 16420 bytes
SHA-256: df557bd4e98d75b3577bf59db666dc709ac231c4916bb54bae08976086078fca
font_02_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 11108 bytes
SHA-256: c4bb8ec0b252634491fceb98686b36ad830a6f1176bc3f1c0686a62bb52c684d