Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35ae6c243d281a4…

MALICIOUS

PDF

87.0 KB Created: 2021-10-12 10:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a50ed6ccddcb8975d7bb89ee4db19ee SHA-1: 7a7a0542366e475fd6266171742c328e3bd56093 SHA-256: d35ae6c243d281a495658160efb663acaa6332f4718871acc5ba9fbe06cab434
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the phishing lure. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=cannot+find+zipfile+directory
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/48632571358.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/putedefizagetuv.pdf
    • http://infoguard.ru/content/file/bofolak.pdf
    • http://balalajka.nu/media/25253788691.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/mokakotuwikakugisogumuzo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161583135de354---29035118402.pdf
    • http://aapltd.net/userfiles/file/75866673001.pdf
    • https://genegurumiraclehealer.com/userfiles/file/wotanosokiraxevosuna.pdf
    • http://thinhhoanggia.vn/Images_upload/files/madogikegasafalazoterufu.pdf
    • http://menifee.hanasushichoice.com/uploads/files/mevulovamemo.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/noral.pdf
    • http://papinchess.ru/userfiles/file/40058134810.pdf
    • http://heydarbaba.org/resimler/files/26576270961.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615323326ab3c---xalokufosarubutanebow.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/juvapederirorefivebe.pdf
    • http://3q1p.com/upload/file/210917042812108046ullmd6xyxx2y.pdf
    • http://dilimkebab.com/userfiles/file/visoduz.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/g1sjmmaq46cq76l01tvqrqrbbu/64689081521.pdf
    • http://vladjurnalist.ru/archive/file/bigafid.pdf
    • http://bigdoughpizza.com/uploads/files/rixoledobul.pdf
    • https://gplacestracker.com/userfiles/file/xodusijaruluxupexirejubu.pdf
    • http://radio6deenero.com/uploaded/files/bejibuzim.pdf
    • http://chalappuram.com/userfiles/file/5420156661.pdf
    • 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_off0000e499.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 16792 bytes
font_01_sfnt_off0000fcb0.bin
aa6eb39cfb1fac35578b2ba61d0483d959a0aaa5191bc7da873222be13329d87
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 10648 bytes
font_02_sfnt_off00011546.bin
bdf7ff89d656906a3678979ddc2ff4dbcaf8f20b253581dd53805578ae50f259
pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 21508 bytes