Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b1e40ed868d56c…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 16:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a1b0a7f45affe6acb5db9e6f542361f SHA-1: e305e93118bf8ba92d6d5a6ceccba539f7339963 SHA-256: 32b1e40ed868d56c57db028158df9f8dc5b9cd4b1f920dc5d05be570262c5bd6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous embedded URLs, many hosted on what appear to be compromised or disposable domains, supports the conclusion that this PDF is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://snypes.nl/img/customer//files/lamulara.pdf
    • http://sam-global.ch/files/file/lamovikifopuro.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d543f2f1945---vabirerefifar.pdf
    • http://svaz-podnikani.cz/files/file/gidusekasuwusifodewelute.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/79146438686.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f8d88697---70663925619.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/171232997cb87d9b2b30c2f24bb3d488/rerugamadepefemoxefux.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a378478c---teritowisuwexewedejab.pdf
    • http://ecandrychow.pl/Image/files/piletasediba.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3f7372fd---46408530364.pdf
    • http://usaoxin.com/userfiles/2021-6/file/89132301759.pdf
    • https://addsfly.com/userfiles/file/17784933489.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vbjb20ha01ojvatu39jl856912/vavin.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bceecb8cb5b8eef61b530bc949e7c30c/pudobizitarimapad.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qjurqov6c6huvl4tiidg34ue52/51977704031.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d0c0acce---50353778603.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb31c1fdad---58228146986.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=interview+questions+and+answers+for+civil+engineering
    • 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_off0000e522.bin
ccb49b9d1b67539a699c5dd1038e270d2b79653b42b973e85fa6c8e87cb23bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 16552 bytes
font_01_sfnt_off00010fec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 16792 bytes
font_02_sfnt_off00012803.bin
81f6664b2f0ff08bc8429d9d5b4bffe826c73ca9f561be2413c1b86cbe5e39d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 11000 bytes