Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a3b3052747aeba…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 04:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3878044a1813b6cafe4671025c627f8 SHA-1: e564645737d80845a3ad6d3e721e7c1ab57846ad SHA-256: f9a3b3052747aebad80858808c08340d6e17bcba0f7d7f167dad1694ad828c3a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it is used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=bearings+types+and+their+application+pdf PDF link annotation
    • http://immobilieninvestors.eu/userfiles/file/pulifapudo.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/10837993005.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/revijodanape.pdfIn PDF document text
    • https://schmitz.cz/res/file/59398696371.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/40576033211.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48072c104f---baxavufesodozakukadatot.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8edf281639f2de5421f201f2bf011588/wulazeromewebupininud.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/46122523565.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/sofipiniledabigosisax.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/mujisuw.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lenenidajozimizalagajijum.pdfIn PDF document text
    • http://liyangah.com/Upload/file/13140507869.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f32350d44---45071311739.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/24880721046.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/liwoxefetonijazopugexe.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rasodifu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1620888198251442383.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/95536562559.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nitutametote.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/wakerixe.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/fajidinilokesuvulal.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/d17j5gvm45kusggu5n2tc1olva/meletaminufatobikifojena.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dcshfq7i3isvsepuvcpk3qik3t/51529690147.pdfIn PDF document text
    • 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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 11064 bytes
SHA-256: 1016351e94e7f92a66cd05623c0daf5da8470f942e728e297db75886fe7fc874
font_01_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 17488 bytes
SHA-256: 95e5938a46ca2503335fcc12f86b2a8186e099fa443d39a47f985ba666dec715

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