Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dafffde6109a856…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30ad34043b30717b129bfa13beafeb99 SHA-1: 22ad4c23f765b852934c425ede3771d146ebf9e0 SHA-256: 5dafffde6109a856c2d89d382c4680c4ee87ecdc87cc545aed7661721b1ffb6e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term_redirector=True' further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/16385794044.pdf
    • https://tefen67.com/userfiles/files/66273792380.pdf
    • http://beijingteye.com/upload/files/1500409899.pdf
    • http://marklaliberte.com/fckupload/file/62799622342.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/52992781881.pdf
    • http://hodori247.com/uploads/files/16348011808.pdf
    • http://etabetasurvey.com/userfiles/files/5617715578.pdf
    • http://naim.naparts.com/images/fck/file/42623314870.pdf
    • https://jurvamartin.com/userfiles/file/306798943.pdf
    • http://sportingfoundation.com/uploads/file/detoligibufikigu.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/wawesopedajeze.pdf
    • http://orderkai.com/uploads/files/vobagikuxowurute.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161415e50880e2---43337167311.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/17411027756.pdf
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/sovalibogegipo.pdf
    • https://zweefvlieg.net/userfiles/file/tebikopetegejus.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/42870965246.pdf
    • https://ristovski.mk/public_html/upload/userfiles/file/telenawetow.pdf
    • http://epicridesnepal.com/files/sosodonada.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614655cfc7d54---1006182410.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcc0c5a2a---29402954855.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+draw+a+cow
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000df92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 16792 bytes
font_01_sfnt_off0000f7a4.bin
f450809da4216bd9da7a7a254ea00d3d0284ad6c304b3da4fe4e7930d66b1d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 17032 bytes
font_02_sfnt_off000123ac.bin
fe6ab8537d2dec6bd9fcaf17b7245dc4b28c2f3a71be2034f0d362bc9ac8237c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 9900 bytes

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