Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac159b6a33512e89…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 08:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14b018b0940d81ab70f35a5a22901fea SHA-1: bd0c182cdc3dd4a86f63280f5b254a7991b8d9ec SHA-256: ac159b6a33512e89392d7cb282adaa22dd4f099ef3d601612642a040feac35eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ccuqg7qba7u6hf60e7t1pgdr27/mabajotuvukajumejisin.pdf In PDF document text
    • https://medtek.vn/storage/file/73028863940.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074af6d7e303---78774931048.pdfIn PDF document text
    • http://biomisszio.hu/tmp/35170938582.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/17072039009.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/15528197207.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jv5khf26pq1mrggub5avgl90af/zominaxusube.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/fb67c42f28b7fc7bd7161dab064a6f84/52689521635.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630763c58c---gomalugixobixanazaso.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/meladamuru.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a8ac5115a---kukewowalotigu.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/75977875565.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/44548161762.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/sakagejab.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/zimepexumajujut.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/19260132714.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/49588517889.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/tezubezokiro.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/sisukotariwetugimure.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/66318231896.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/xolan.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/nonepewovine.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i96vvfhm4ja9h19via1t08r10e/fosufebofor.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/83720164347.pdfIn PDF document text
    • http://wamer.org/userfiles/file/judebivalakipewuzirotak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=analise+swot+da+nestle+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/gisupajufudutijum.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://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_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 19524 bytes
SHA-256: 1e3256c227d02a351af01a2b1e80fee194da3fdbf3bba448a87921c24934a3c2
font_01_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 10456 bytes
SHA-256: 411485d609fbb58181a94401d00dc110bb57a6d369905366eef2fdda2823739e
font_02_sfnt_off00012eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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