Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad373f8f5c202287…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 21:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5419e556ca8271c0b58f3d65ecc1a08b SHA-1: f9da192e24917431183e03634c37d163d044ce8a SHA-256: ad373f8f5c202287be19349843871c7e5517d16d2087d34a0842ebe277b5dcd8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to distribute further malware or phish users. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/49435a7aeddec98f97da94f8dcdbada8/daxudavupevetabexu.pdf In PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/lawasupatiwekowakemusexa.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/vezogizudujuwidu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7cdb287a6f5cf2517c3b13c5709e0b1c/wuvotetadewurija.pdfIn PDF document text
    • http://kisito.com/userfiles/file/39330752492.pdfIn PDF document text
    • https://petala.gr/userfiles/file/16797649620.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/43893418496.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/66679379560.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/52788161793.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/2640223361.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af621d633a9---72145972791.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/30d6dd9915f5a52da4467a3771add32e/52415497003.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/50882884707.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/7975889964.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/tusogezulubi.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/2430415518.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/42513156698.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/16857099963.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/tumijarubi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rk8f09l8a8jfemmcvfbrofi5jo/gojowezi.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/70117612555.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/kazevidonemuvulupo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/234b14239c41b57dddaa1e1290e6c587/43415085978.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792bf699383---zibiwude.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/84077533490.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/41068662938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=from+russia+with+love+psp+gamePDF 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 17224 bytes
SHA-256: e93d95f6b99b25dc2cfd35b652fb6aaf7812c4d65dbe758a007cfe5d599dad9f
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 10824 bytes
SHA-256: 76c06e9325cae67c1ab8fb0b81fb298e15598fcbd414e253302e1bd292f00579