Malicious PDF — malware analysis report

Static analysis result for SHA-256 9251870d86239fac…

MALICIOUS

PDF

87.3 KB Created: 2021-09-23 23:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f113a1e6150ab6e6aac47c901b02a659 SHA-1: 564ae8ba4811e309a9cd07a0db51ad66904a86e7 SHA-256: 9251870d86239fac02b5f83a46524093f72d45efd17341a013ea7786dc984615
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the ClamAV detection point to a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=how+to+get+gta+on+android
    • http://elosc.com/upFile/file///ITX202109011306537908.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/xedupemiponefifusedi.pdf
    • https://jensbrode.de/files/file/99397722648.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f95ec93d1---8617099329.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/vaxeferawax.pdf
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/79267630343.pdf
    • http://faceconnects.com/ci/userfiles/files/60884051584.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/duterosafiwaloxaf.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/fovojelelodotulivibug.pdf
    • http://netart.hu/userfiles/file/wuvopinupowokekiw.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427ff1d377a---90341485215.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab180941ad---14060970964.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/pitaboxipipufemi.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612f566de145a---xeleromelerofevuno.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437e778caec---51364028143.pdf
    • http://surestegc.org/documentos/file/32424530500.pdf
    • http://umhouses.com/uploads/files/49783964454.pdf
    • https://accessnepal.org/userfiles/file/fipixoxev.pdf
    • http://jodhpurheritagewalk.com/images/file/nanuwivuso.pdf
    • https://daaeportrett.no/upload/file/43352952532.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9518b666---wogarebudigewejad.pdf
    • http://billedbutikken.dk/articlefiles/file/gazilavewuzozigu.pdf
    • http://ordineveterinarireggioemilia.it/userfiles/files/61115318927.pdf
    • http://noavarservice.com/ckfinder/userfiles/files/35672475960.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f337.bin
c07a281b838fbec117559a30a9ad92e55b7748f4ef08d73a72acad6dfd6bf824
pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10284 bytes
font_01_sfnt_off00010a48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 16792 bytes
font_02_sfnt_off0001225a.bin
2d9721837c04504db1e9dc68510df58607c693af557ecad79368921e8a90126e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 17380 bytes