Malicious PDF — malware analysis report

Static analysis result for SHA-256 375989474f076b14…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 08:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25847aa98d44dbdb51710ae9e3d4b81c SHA-1: 62577b6c7c0a8dfb3162e6c48fd6cac5d8720392 SHA-256: 375989474f076b14130f10e6f52ab7cca17de59a3141164721cb254b49849c3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://zsdbiopharm.com/upload/files/2612568570.pdf In PDF document text
    • http://sk-uralstroy.ru/uploads/files/memavokobujep.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/xaniruvugupaberi.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/86791456822.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a058dad38---gizexenujopane.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/sijugenut.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/damikuzi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0033037f7---52709903080.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/bibikaramikubi.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/2825515954.pdfIn PDF document text
    • http://pasaru.com/upload/files/37259159222.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/puruwarep.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/sikakideverineviwikax.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/kogomazisifaxes.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5378b98c2e4dbc019b534f2c95a2a029/garedonujas.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vrvh44plj3j3qmcpmabim7v87g/87448532629.pdfIn PDF document text
    • http://labsshop.com/d/files/4491634801.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021f02759c---matibopedujubopojemota.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/26627819666.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/jazokoro.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/rigikufofitap.pdfIn PDF document text
    • https://tl-systems.hu/files/files/46368136861.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/xixujokenubuga.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/88001770123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=oldboy+korean+streamingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 10964 bytes
SHA-256: 6691fed882c976979d4f79942fba58b94b9ef6e7543fba731600bb41286d58ed
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 18824 bytes
SHA-256: 5d5d3b266d451fc3e7cdb3c04dfd7eae508a74e7085447f723141ab2c9204ffb
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1