Malicious PDF — malware analysis report

Static analysis result for SHA-256 87afa8785e609ad5…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 05:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20e5fd8b280cced76c3e377dab50f762 SHA-1: 8a07675a28fde9ea9ab1a703a77badb8d7a81e5c SHA-256: 87afa8785e609ad5a4749ab3e24ac189a5d62cd81dea4f390ede0a3e0416d5c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites, including those hosted on disposable domains and potentially compromised CMS uploads. The primary function appears to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nature-revive.org/files/file/xadibesoxubuxulomebeda.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608056d0692be---tivovuj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc400b9e8f---33823685445.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/62775491577.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/45964696246.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/9677781886.pdfIn PDF document text
    • http://ledson.ru/upload_picture/tiwogagezudapebikozegem.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/85f650bf27cd2da3e68d80a5bdfe4a12/rufawutoxoge.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/09dsom6891t4h7drm60k6dg4n6/53850560961.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a44a42431c---vagakakepivorametopamufib.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/9614433023.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vagejukovogudukifo.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/sanesafiz.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9pnt790j1acofd0tsf22g3cvjj/83980986216.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/24077490849.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/72438780160.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0365fa40c456c7b5610fe989a4af01ff/besivenilirovadivoregeb.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b517cc1290d---xeguteridogal.pdfIn PDF document text
    • https://zestus.us/admin/images/file/69565091237.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/uoevpnvi4scq3sq2hqise0upf4/rudigozowenabitikoxawitib.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wigetal.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504180948541241.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1627704634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=south+view+elementary+schoolPDF 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_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 10936 bytes
SHA-256: 45a84e05123e7d726c3176973e42e6f1676f67e5e2d94bf9f34b0e2d338e0c3c
font_01_sfnt_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 17280 bytes
SHA-256: 00bf7d71b586f9c2e3316682920875927e70ac282aed1d0d5025606d8d23fc65
font_02_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1