Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae7bb795e8a2bd1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 04:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f6e0be341220aabde29056073c41a328 SHA-1: 967b1a8232994018bdd91a707da006f6c79cb315 SHA-256: 2ae7bb795e8a2bd1eafc56585cd02ef09a2485d17fd231c6542983658d7e40e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_RANDOM_URL_LINK heuristic specifically points to a URL that appears algorithmically generated, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mccartha-cobb.com/userfiles/files/79613816277.pdf In PDF document text
    • https://yuktogel.com/contents//files/13967733455.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b506cfcddcdf517259a749ab0af2ff21/fawupezopup.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773d9ae4c00---6118079695.pdfIn PDF document text
    • https://network-italia.com/file/napeze.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16088692701db1---19301107590.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f0314f496---57720746826.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/fofekomo.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/xapaweniviw.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9c4e8636b---fovete.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c7ebd9f8---90227130932.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b85b17a45fb36e494f5ebc4dcf7e76aa/tujesaz.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc1a73f5f---jenosulojitefedopusenibor.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b263fabd58---jizef.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/kobujezefiwajasufokifu.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/3941a3b9bf25930685fc641d3b853c6e/5689788679.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/danazevoxagasotogejide.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/debusufesokitajumuvizuso.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/libejuxogoxixupe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/phcl0blq4ddd0lrrv6384h7713/xusixu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/10760373751.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/kogedoxexosuzuxamili.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vodisenutigavalugur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sequence+worksheets+grade+1PDF 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_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 18076 bytes
SHA-256: 39e745c1a3632ab1215b6382782099674b744afc08fd5968c812f3681b4a2995
font_01_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 11060 bytes
SHA-256: bb29df7fb47ca95006aec719651da7b80b4a7374d1a9b9002531881d75f7e80f
font_02_sfnt_off00011a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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