Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eb620c7365a3d6…

MALICIOUS

PDF

101.7 KB Created: 2021-06-30 22:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f39ef7522bae9d7796d0320deb86336 SHA-1: 3c26aa90bd743417fd5baa7e0482ed220daea4c4 SHA-256: 27eb620c7365a3d6c8d2fabc94ff84cb90a277ed1e68f7ef6ed8bdb9bd6988db
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination and leverage potentially vulnerable infrastructure.

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 https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/68a6467b9d99038865cba708c127e39d/69880980728.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5acfbab9e---sifepanijewipesuvejo.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f6afa983925ceb6ce8d5a340d9c02ab8/gufejozifujitobatufojetig.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jh13itermpp0nkijobqalpej83/difumoga.pdf
    • http://www.aqsclimited.com/EditorImages/file/46429176451.pdf
    • https://golf-tout-terrain.com/publish/page/file/37088390155.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/28072018338.pdf
    • http://panziofabian.hu/fck_kepek/dokuw.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ab71a6ff---wiruvuvutafaxidowofub.pdf
    • https://avigailpekelman.com/sites/default/files/file/kelezusevuwomodigerow.pdf
    • http://kotolantopeni.cz/file/nerosurebopimewegi.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921946b0176---42501568805.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53483d952---97200661061.pdf
    • http://afghansolar.com/userfiles/file/zavojadojomuzewatelojaf.pdf
    • https://pakistanchristiancongress.org/userfiles/file/8173907842.pdf
    • http://interface-referencement.com/userfiles/file/kajazonozabetani.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c2606090e23c23576d9523a536f75d49/sufegojuxidafunuk.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837b2ebddf---mexefenexolopip.pdf
    • https://fruzsiflame.hu/userfiles/file/kawivosinidivesusitexa.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5e921c62---59645293252.pdf
    • http://kasargod.net/uploads/file/10949514442.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e68e89a9a---90250496491.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sales+management+simplified+pdf+free+download
    • 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_off000129d9.bin
789e2ef635612098a359f014a936ad748aa7598cfd146794995aadca384bf131
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 17632 bytes
font_01_sfnt_off000157eb.bin
1b2df317c0be84507c8d6bc957515fb63fe7471ef1e95b1e0a2a660bfe296745
pdf-font-stream PDF embedded font (sfnt) at offset 0x157EB 11004 bytes
font_02_sfnt_off00017144.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17144 16792 bytes