Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03b07f8c5777868…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9059848be4aa5a0aae31cf9dc0866f5d SHA-1: 5516ba1dd07ff3b7b94561b7a4c11b95890a9e86 SHA-256: e03b07f8c5777868b6fd05ebd9cbc4017ce378dcbb154d3b4c29c96926ecc42a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure of the PDF itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://indiansecuritisation.com/ckfinder/userfiles/files/7056008129.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375bcf7942a---noviduxewaserukaxod.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/voxusevojufewefumakosos.pdf
    • https://efnnma.org/files/file/wewusobew.pdf
    • http://aaz.sk/editor_uploads/files/gatarufokexamofokok.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6n7jr86q7nhf7jds2fi0ip3970/27845873161.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/81682529658.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f4e40634ebd9a53751af8e1b796c0d39/xujugiriduberumuz.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d5be48f3---balopedelor.pdf
    • https://thuaphatlaihanoi.net/uploads/files/94323322150.pdf
    • http://beastyenergy.com/userfiles/file/jaxatibikatope.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a469558b1731aed6c5fcdea29044d958/gagosezulafupogewu.pdf
    • http://hodinovysoused.cz/upload/file/butobe.pdf
    • http://thermcom.cz/userfiles/file/8217013116.pdf
    • http://tcsm62.org/uploads/news/file/wetimun.pdf
    • https://baoholaodong24.com/userfiles/file/83592424899.pdf
    • https://verner.lt/images/files/9514569903.pdf
    • http://shyjjc.com/v15/Upload/file/20219251915179970.pdf
    • http://balone.net/_upload/file///magalobarolawutagunim.pdf
    • http://webminmax.com/userfiles/file/96054362495.pdf
    • http://tucsokszekszard.hu/images/news/file/lezivunawefubaz.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/lexawojolugogax.pdf
    • https://adoz.cz/ckfinder/userfiles/files/lusozudikakitedun.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+lock+settings
    • 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_off0000b1e3.bin
b1b6124830c4d845fe7279256db0cc693156bd9eb9e2fe1e4abce5c89c7044e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 10456 bytes
font_01_sfnt_off0000c98b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 16792 bytes
font_02_sfnt_off0000e19d.bin
f4423ccea7e6bde194e533a14bea04c79c31ad0506da5898f973b035fa92e2eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 15184 bytes