Malicious PDF — malware analysis report

Static analysis result for SHA-256 3226f133d50c3745…

MALICIOUS

PDF

84.5 KB Created: 2021-07-25 10:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 541ab384cfcbc1ad8848af8af7f9eff5 SHA-1: 45e9ef4d43b6115cbc740ecaea568c5512986be7 SHA-256: 3226f133d50c3745211db5eeb55a63762e05d2fce3e2ce9c0a08ac0ca32d553a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/xowuligaj.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4bfa6f6f443d282705c63e725ed355e0/42029942520.pdf
    • http://dailythang.com/userfiles/files/xubexato.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/47419636782.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160739119b6a5f---60745435529.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/vimefatodojawodot.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249e2d66e5---tubofumo.pdf
    • http://kubak-ubezpieczenia.pl/userfiles/file/baramofuzazupago.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8955b821b---botezafebe.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9irs9uv9v5h0danbgtfal2h345/22444838778.pdf
    • https://rzfmuhasebe.com/userfiles/file/78964832936.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8m9prdl0qpeqeo6oveibns7q01/fowim.pdf
    • http://hevolta.com/upload/file/fanatazataju.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ecb84c47---fovixenizumozagixisub.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fa2f4b8d929d99313b3009fa07fb49cc/77177578700.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-9/20210609171115560442.pdf
    • http://vamaconsulting.sk/userfiles/file/detiv.pdf
    • http://backupcenters.com/userfiles/file/mujiliwe.pdf
    • http://omonetach.pl/foto/ilustracje/file/wafudebasuzofuwomid.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e2bcefdd---35840617772.pdf
    • http://e-hane.com/files/wumogegemopasevefalu.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff41a841e---dubaxewizogijunodikuvamix.pdf
    • https://alianzatours.com/imagenes/file/lugodafopefinal.pdf
    • https://agrilaui.com/userfiles/file/14754844332.pdf
    • https://implant-drill.com/userfiles/file/8631903822.pdf
    • http://onishi-kyosendo.jp/archive/mefomevuwoseresezamekad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=scripture+coloring+pages+for+toddlers
    • 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_off0000e700.bin
40c8ceb9a2f853cd6d0bb62fc4f9c16fb6a46e6aeaeaefda43a77e106ab8d941
pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 10972 bytes
font_01_sfnt_off0001005a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 16792 bytes
font_02_sfnt_off0001186c.bin
41998b3b9e0c27b623981623754b3653725a326c68a40b7929c5a7c7362ddeaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 16552 bytes