Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7d51b81c10f067…

MALICIOUS

PDF

95.4 KB Created: 2021-07-04 13:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fa1177c25bf5820972cb4ad67345155 SHA-1: bc980757d035ccb51234920d7b958a8aa5d29eec SHA-256: ab7d51b81c10f067ba14c7bd6ab030d4ab0fec8b26b83cd9c062bbb1d9b446d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites hosting further PDF files. Heuristics indicate this is a link farm designed to distribute malicious content, with ClamAV detecting it as a phishing trojan. The ML classifier also strongly flagged it as malicious. No scripts were extracted, but the structure suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3f8da0f88be170ec450ecc068f3c3ac5/waleturofotaxem.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/21542556464.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3abf21924e7e86729280a4614408e79e/65627265528.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/856j006vujt9bi2htecujk23jq/lezotuvofitisorotiwut.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69230a3f54ec26de09d525d11d8ad761/padukadenemogu.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/26f4fdfab230512cf9e9a81b98d2b224/semakenopor.pdf
    • http://nguyenthaotech.com/upload/files/8067448190.pdf
    • https://volnynaklad.cz/data/file/18087113604.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5c593a07ec6b44ed00f5554b8f77b673/takojapiputuxolo.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16085102ed4d30---xudoda.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b91ecb0d---garujemu.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bm0pghsl6mkoq7ierlckvf5kfp/musozugizuwo.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d82e42306---29210932689.pdf
    • http://grandp.ru/userfiles/file/taxugunaboxas.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160758a7b7bc99---83414872203.pdf
    • https://advantagelic.com/singhania/downloads/file/49289533624.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/fixeguvevazasozudobana.pdf
    • http://phuocthuan.vn/images/pic/file/17809630081.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b12668a66a3---retorudavirakuta.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185f993cd5---9944282530.pdf
    • http://musorcentrum.hu/files/article/file/faganejekupego.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=aed+to+nis
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe9.bin
8b143db1dc50c71e97ab8cc83bb24399475021b45222115f71a955648db3b4db
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 18192 bytes
font_01_sfnt_off00012be7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 16792 bytes
font_02_sfnt_off000143fd.bin
d681dda039cb3fb0b1892dc5be28e6ad7aa94dd459d1da1927b6668726b7c5b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x143FD 9916 bytes
font_03_sfnt_off00015a06.bin
c39642271528b1a72d4dd9819c8170e75af951c235149b18c303f7f6c6a34e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A06 16340 bytes