Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60fb99792c2a0fa…

MALICIOUS

PDF

68.0 KB Created: 2021-09-24 19:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fe7de869683fab61f5a340b756ec1db SHA-1: 7b555170964f2e7446606131a1486ab4bbe50c60 SHA-256: c60fb99792c2a0fab2790a4a1f98583b77c7cac685db075c275eb921632539c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The document contains numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=how+to+get+free+fortnite+skins+2021
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614423ee19812---xejudupaxijimimif.pdf
    • http://nincity.de/inline/file/51344196839.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/27245933074.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/leteriretuwi.pdf
    • https://thibiditrading.com/public/userupload/files/49461100919.pdf
    • https://alev.az/userfiles/file/najunudidosanupepegaw.pdf
    • http://apexnepaltravel.com/userfiles/file/45281289732.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/53522380191.pdf
    • http://namlinhchisapa.com/userfiles/image/file/70980806668.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/86094125866.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c4mi7ck6bo6edvl5to7tsuqhd4/93099896309.pdf
    • https://viceda.com/userfiles/file/buwulezenor.pdf
    • https://unovosti.tv/ckfinder/userfiles/files/42010641087.pdf
    • http://studiotecnicolari.it/userfiles/files/tubimemepunodefovu.pdf
    • http://jadever.vn/Images_upload/files/20734981866.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80690636455.pdf
    • https://autoteam.in/ckfinder/userfiles/files/47888541417.pdf
    • https://webaprint.be/img/file/18898238149.pdf
    • https://thefencedocumentary.com/adminfiles/file/resulujagepubuv.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/66141268800.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23f52e3e5---goverixog.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba74c860e4---91237827451.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad2f.bin
f29ef1ff4673bedbe1f70b6e0b53e704dd666c8950ad7099d63745360afeec15
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2F 10644 bytes
font_01_sfnt_off0000c5d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 16792 bytes
font_02_sfnt_off0000dde2.bin
304acaaeae4312c1a3be2319febd360324ab7969d3700c288afc7848482b22de
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 14672 bytes