Malicious PDF — malware analysis report

Static analysis result for SHA-256 441562f9417bf565…

MALICIOUS

PDF

85.1 KB Created: 2021-10-09 14:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65abe70cfac10b75d90cbd04ed0121aa SHA-1: 6a25ab58537e25a6b388bff489fe20ae56541d55 SHA-256: 441562f9417bf565791c409c557c0376430ab4a5ec530ea1d1eb091aba8ca78d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://melly-incendie.fr/img_db/17062782878.pdf
    • https://camphacement.vn/upload/files/84732616181.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/79097700460.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/a4e8komgqkamnmmms8hg92mpko/zatamazebomavorumezifemo.pdf
    • http://yacpa.org/yacpafiles/file/zujogagimotevo.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdeb4d9bee---76851512824.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/savedatixixozibe.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614413b4e4cf1---82951275464.pdf
    • http://panova-art.com/files/file/1533545145.pdf
    • https://etcbt.com/userfiles/file/texufipisilusasow.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161337e9b40fcd---59038186721.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3db3643f7---40346993237.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd981dcdf9---tidolixuxadekanobire.pdf
    • https://ons-station.com/editor_upload/file/47886360137.pdf
    • http://cosyromania.com/media/file/rijivegufizitixenuvalu.pdf
    • https://simpangkanan.com/contents/files/59853998695.pdf
    • http://thedewakohchang.com/image/upload/File/okapofebuwo.pdf
    • http://mtsskzy.com/userfiles/file/1702005814.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0e28e1dac---pewowodurenow.pdf
    • http://bluebossa.pl/files/file/geboxa.pdf
    • http://agcslohian.com/userfiles/file/tedewesojutuv.pdf
    • http://palami.by/images/file/mezene.pdf
    • http://slkuang.com/v15/Upload/file/202110216333515.pdf
    • http://sattosushi.com/uploads/files/76391009970.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+remove+picture+border+in+word
    • 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_off0000e501.bin
c662068ad393d05d94231c9c816a55e784d1d54360c50fea0ccd0f74ab9da545
pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 10680 bytes
font_01_sfnt_off0000fd38.bin
b6bab5e1ed75b1f01a25a7db208f6ade9d169129450070c0f6d3abe67ef49fad
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 18832 bytes
font_02_sfnt_off00012e90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 16792 bytes