Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb0b34eaf96360a…

MALICIOUS

PDF

78.7 KB Created: 2021-08-03 16:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d2e5f8ba3e64f10837093774e2035a3 SHA-1: 92a59bf4482a9f13bba102bdbd10e68166b10145 SHA-256: ebb0b34eaf96360a163e08012772fa635c5918a84bc87d33ecf67209ef95c908
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall heuristic profile points to a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7tei7d7cf3os21vm039ncnn6g6/92518801021.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/82236f963dcc910e2c8d28f068f2ef1f/65385520041.pdf
    • https://renetravel.ro/images/files/zogawetanelenem.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/waxikupaduriwif.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/d04f0fed2fe841298e2935c7341bf7ce/35818120051.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb56442d2f---7550479077.pdf
    • http://clinicaveterinariacittadivignola.com/userfiles/files/videbopalekituzaruxi.pdf
    • http://sarljarry.fr/userfiles/file/tekafusete.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/6phpp8qhd03br2u062jddhs84s/pazafo.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a3993c9d---jodupifumojovajoma.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/vidiganafesenixegazo.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3ffbb62e---51938800470.pdf
    • https://argumentua.com/i/file/nifubuvukimovoxux.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e83d02fb6---notukonobinujive.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3d52d115---rudupodoxadezovusewexivar.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/55686705524.pdf
    • https://lapalettedesarts.fr/gestion/file/62628854744.pdf
    • http://austria-ex.com/images/blog//file/99438524514.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210626074729.pdf
    • https://bfull.ru/uploads/files/12941431957.pdf
    • http://thedreams.cz/files/woxisumoranewisugibisoki.pdf
    • http://masan315.net/board/imagefile/file/5093690038.pdf
    • http://best-infosystems.com/userfiles/file/jefajegi.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b734eb87438---fogudezanejegoleji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+big+book+of+knowledge+1001+questions+and+answers
    • 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_off0000cdb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 16792 bytes
font_01_sfnt_off0000e5c9.bin
a4f115f026184a0c5d85a1be75fe4ea9553259a06fea6539caea1c0d0693be27
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 17080 bytes
font_02_sfnt_off00011235.bin
d072fe30ee147cf6cda03e02b0c0660599e947dabd0017138e69dcf362cf56f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 11332 bytes