Malicious PDF — malware analysis report

Static analysis result for SHA-256 2354cd863185ed59…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 03:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7098ee20dd09de480f41f012ecd2046 SHA-1: 525fef7f5e5fcbed5ee1f79261a64a3cfb53a298 SHA-256: 2354cd863185ed598d0287e018c91909a1f4f20de1b021350b2304eb6fc85e00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest an intent to redirect users to malicious content. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://abogarestudio.com/userfiles/file/lizedoxewusomonapujipanik.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/mvqt9f2pb5o36gvv7fe0nb5j2e/lafezepekowapewixixuku.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/s2vvqpu526g9s3gpf4bid8j0e1/74785852205.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d023018998---20516744462.pdf
    • http://velo.hu/UserFiles//file/xigaragopigejasenaxu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd472bb2765---76636990511.pdf
    • http://derkwoo.com/upload/editor/files/67858382985.pdf
    • https://aterhesseg.com/up_image/file/wapedavabin.pdf
    • http://www.victoriousintl.com/new/resource/files/93661083144.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/db7cb96f9d0fff84f78129a6e34be242/kufedidegoziseve.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ac3a2321---38958492362.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8b52e15ae70d13b5fc9e53cc21a31dcf/nijalexu.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/emm7h4kibmrb5952rasgc02441/78682256698.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848bc605402---58294804517.pdf
    • http://ccforum.kr/uploads/file/1624376508.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb68422e---lodoxetub.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/o9vgoia5c2pmt8sd11gdkcoa90/48261129477.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/c9226eqc8cv5q65lrecdd61hv6/42160435439.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/89ba2854edbc635f8035f49f5086b676/22756339090.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f539042f91---82016205327.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160837dd37ba61---turomesaxawivobovikaluk.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d0da257b7---47933884532.pdf
    • http://accessiblevehicleservices.com/userfiles/file/86332815033.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=accidental+death+and+dismemberment+meaning
    • 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_off0000ee3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16792 bytes
font_01_sfnt_off00010653.bin
bd1d43c0db1f091e3a600e28afcccaddc5385c925ce4f0cd425fe7d2c6608afe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 10816 bytes
font_02_sfnt_off00011ed8.bin
b6c74a1e7038439f584985f3a9dc0753cfc12a5c1b45c8e4a982ddeb2fed1185
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 17612 bytes