Malicious PDF — malware analysis report

Static analysis result for SHA-256 0864e896b9c82dd0…

MALICIOUS

PDF

72.5 KB Created: 2021-09-11 23:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1bbc1290c630279c9665bf3d12058ec4 SHA-1: 57d510a71de11c15fc5846af3bbd1523f18bf3b1 SHA-256: 0864e896b9c82dd0d228e60458b4edcc10f49ad0563b339957647d22c506346a
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. ClamAV and ML classifiers flagged this file as a phishing trojan, indicating a malicious intent to lure users to harmful content. The presence of numerous external URIs and the detection as a phishing trojan strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.roosprommenschenckelfoundation.nl/ckfinder/files/files/58299688305.pdf In PDF document text
    • https://sananselmo.com/wysiwygfiles/file/wilaxesuzidevasek.pdfIn PDF document text
    • https://birudongker.com/contents/files/2121926796.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/97347950504.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/63496996877.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/xibotoxabem.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/rijorepevilewajofafedivus.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/63774783622.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906162318867975.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/50ebfc4b39920dc6e1f2254d0fc36801/kolet.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210903035433.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5b073k7nfrpff09m9drbfrkl7o/nikenematububavil.pdfIn PDF document text
    • http://thegioioto.store/upload/files/bewenelumon.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/73214841389.pdfIn PDF document text
    • http://budka39.ru/files/86691207247.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357e35d31d2---96148552542.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/46678990166.pdfIn PDF document text
    • http://innotack.com/userfiles/file/91748710612.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/42919043350.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137acb6a4c0e---12998753405.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/62816947219.pdfIn PDF document text
    • https://linker.tw/files/75666435908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+edit+pdf+file+in+android+for+freePDF 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_off0000bc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC48 15792 bytes
SHA-256: 3b406581445abde7d671230a62440b869267f1107798d33713392c7fee079f94
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 10400 bytes
SHA-256: 7a3bda8c81a27f72ffc4037ba0f8c8e4eb96e0d8b89c4dac92467bca57492765