Malicious PDF — malware analysis report

Static analysis result for SHA-256 931706fa6d4b40c7…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 00:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f49f4973b1697abc55eb401e4bb4800 SHA-1: 0d080bef7878476c9467c53fc2cccb931c5c9fa3 SHA-256: 931706fa6d4b40c7e6e3c001105e4a874e2f74a6ff6cd44edf21bf91b295db8b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple links on potentially disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.photonics-science.com/ckfinder/userfiles/files/zixefapunexoleselul.pdf In PDF document text
    • https://red-adlay.com/upload/files/lusenavapotanagujop.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/jorelazibateworato.pdfIn PDF document text
    • http://medrea.ru/upload/files/logipenure.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/35349917294.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/47282989454.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bfae6212f7b8a14484c0e783972808a/35789150069.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d39ccdef351---mipoful.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/54051786436.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/rugaxapibegu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5c261920---pabizadudelalojufuvumunis.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c8b113d53---bowugenelugekurubudaseb.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd698eb05d2---dugusojovimawiraxobewuw.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/85182404163.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c5ae7a3c---96740383177.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/50044089973.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c907b17fc4---gatojuzokaxepu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08da04656---fizuzomuwelot.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/dbf60961d38d09a99ca35e069e56230c/58842453521.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/sofojepugegobiwagi.pdfIn PDF document text
    • http://poultech.net/d/files/50523043663.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2f76e4e77ec7bb16ea8ab4507aa9844d/31088856485.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/vajegowujudezapujoguva.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076212b959d4---xanomazidaluzejatutobawap.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9282ca66c5ac9c0c87342df85cb4849c/pobuxunemenajapaj.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/dulizexerup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+animate+in+google+slides+on+ipadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ffe9e13b---52001984157.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_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 10928 bytes
SHA-256: ec3c3a1d8e02c662dea798f97550fa95deea39a226e5b084e2dba86b4eefa1da
font_01_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 17180 bytes
SHA-256: 1c8e5f69cd3a567d50bb939e57d03359066b389f55d729eafe992fa681193980
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1