Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f743f8f8fddc55…

MALICIOUS

PDF

66.6 KB Created: 2021-05-13 06:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd0037a54b6e07bebf9babf93c884077 SHA-1: 20e687ee2e892b6709d8ee63d1826344ec79a6cf SHA-256: c8f743f8f8fddc5573764680f973a65bd555291443b8dcefc006d20b0d4b5908
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body text, though obfuscated, contains keywords related to search terms, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d2af340d---12855039284.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5hsqkv60nk0n9hem8ot39du36r/zigizepapefisurasujaviw.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f2a1202de11ff5e175757ac721fb1267/xufobobezarom.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2b9983363f02ad7a9b7a44fe3db32631/99415900646.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891a3cf7d8---5037477861.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/02a6mrdau3834nmsqa08u0hvq6/38878708721.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v6idjgj8a5o9o6u0qaeja5nfm3/nolotigebegebirenofesedot.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d0a9fc51---rabogatipazodek.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b4b25e8599dffcbc026c7ba7e4ce2f3/vexumobitebizazezediladi.pdf
    • https://accuratesearch.com/userfiles/file/dakukokimugol.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/i25a47e17pauvvm49cmoo98dk2/82878909339.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cbd0ff3448acd29b81fdb10f98ec4812/18732300897.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1b1aff10---19233038311.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f977a3c49---jejinagigisafifopojugi.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed2f854e9---59569126573.pdf
    • https://advance-pack.com/editor_upload/file/wixemasezuwupika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bittorrent++linux+mint
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff1.bin
3fcda4ea4d6e58d699653edb09b0f5fe3d491e394fa2d032e62c336ec02ae003		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 4560 bytes
font_01_sfnt_off0000df61.bin
1e6735039e6d6c737ecae3f994bfe3ad499fc78ad4f1629f4c3a350bceb0182a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 11688 bytes

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