Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fe5db77025e003…

MALICIOUS

PDF

68.2 KB Created: 2021-09-05 03:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a0d389ed3c88f09dc7284625d2f7a96 SHA-1: f58c9156b5fec6405cc06a890fae444fc9b972e9 SHA-256: 71fe5db77025e0038071b52c584def8eae9bc4adf7189ae2886fa6de0286c3b3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing lure technique, presenting itself as an image to obscure clickable links. Multiple heuristics indicate it's a link farm hosted on compromised CMS uploads, designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=hollow+block+maker+manual PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/jnnebtljv7j12me3ac3icrtur3/48820748071.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/15025693850.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609359b9efbba---bigudogazefibugafogo.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/8bd712f79afeabba17ec397e5843fc4a/kameke.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef255f3047---53865683990.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/81521799653.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161121dc31846c---18487812145.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16079efce81c9c---talenelubig.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/86196510545.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jetifenu.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/lifuxedad.pdfIn PDF document text
    • http://charivne.info/images/file/kavipopo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/tuxomuvevakakifivu.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/vagiviwitike.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108300942175015.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/dasoriwiwowulowoles.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/wopivewibevozabutuzix.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/21353356893.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6863b817d---valugoxitegotefateguvaf.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107231721537276.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee0a0bd21---20977761732.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/4732683179.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16106380a00011---80079304879.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e053242b---golusodox.pdfIn PDF document text
    • 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_off0000b1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 10440 bytes
SHA-256: dc7451576b3c91215456b500a9ff9fb4b45df91f7b772aa8a52e523ed42c9ea6
font_02_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 13900 bytes
SHA-256: 83c0348809ae19071a4a6b7e9bf15e96c9d0fa5b220a4978a2efe294de0067de