Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c04799be4e913e…

MALICIOUS

PDF

94.7 KB Created: 2021-09-10 14:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9203dc7526b19cc02b5c016735ce4a8 SHA-1: a22c43907d96b241c1d154b9f3e166638c2b9284 SHA-256: 88c04799be4e913e2ca2a4aff33aca83ffef2fd8774b1d439695e17f41290d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=watch+once+upon+a+time+in+hollywood+online+free+123movies
    • http://emanuelarombiarchitetto.eu/userfiles/files/lokakupepumubav.pdf
    • http://physio-praxismitte.de/userfiles/zojuwe.pdf
    • https://csam-villepinte.org/uploads/images/file/sovoputepaxu.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/12146d8d22f2675f3b172f4bb717457f/kabozamazole.pdf
    • http://cableesmaltado.com/d/files/58062394408.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/aef701e1b1e64f6e0656764b746c1b42/fokogovap.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/19882685645.pdf
    • https://nezrenpin.com/calisma2/files/uploads/rogemuxikaputagejipuweno.pdf
    • http://arablift.net/userfiles/file/kapozofirokedivemitome.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/48198014872.pdf
    • https://tinhhoaxanh.vn/userfiles/file/tegevejelokimoganav.pdf
    • http://thienlongadv.com/upload/files/zaniluzepagu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed09692ff---94489187750.pdf
    • http://klpa.net/userData/board/file/37153690865.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613af85388492---jododezu.pdf
    • https://chaletsuenodesol.de/files/kexuwazusud.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161323e975954f---81497386975.pdf
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/mosoxajole.pdf
    • https://itchanoi.vn/uploads/news_file/kapavuwe.pdf
    • https://tomorrowhubs.com/upload/users/files/39593601689.pdf
    • http://lexxyin.net/files/fckeditor/file/perisaxazit.pdf
    • https://turkuazhost.com/calisma2/files/uploads/79512081063.pdf
    • https://rubfila.in/files/file/48687631962.pdf
    • http://accronline.com/userfiles/file/nifofudorimaxemexos.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_off00010aac.bin
83d20edd76fe3a3f6485b3592326071b80726f111a8429cb2eaf60b70c135bcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 17968 bytes
font_01_sfnt_off0001398d.bin
8b33e13af51f366eaf496a84c2b10c0cf5c65defca1495909540e86f953bf54e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398D 11588 bytes
font_02_sfnt_off0001550f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1550F 16792 bytes