Malicious PDF — malware analysis report

Static analysis result for SHA-256 abde2846b6b21e67…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 16:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31c47a8db353a1fda7bfdd98d05330f1 SHA-1: 3517f881769ca0c2d84910980a5f51ffbd190ac1 SHA-256: abde2846b6b21e679d90cdaac4bca67f682a15908e29b4eb3e1c4f0746a01cd0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hzyixiangchem.com/upload/files/bakazilumanurugadejafurop.pdf In PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8eb975391175afd828bc85ce7ad3f4b2/jowari.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/72249956076.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/13186915867.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/mukoludirotekum.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/57pfta3c7f01akskp27q0rkjf6/69427941042.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xoxetisusetiwatumovew.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/39346873706.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/fpe77bj4f5rejmgq77ahvqskla/58154912777.pdfIn PDF document text
    • http://megalaserasia.com/upload///zinimexuw.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/sijufudifu.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/94330001848.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd4f058c7---58346515159.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/58504575959.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44abc68b1---lepowofugamirap.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/97595017871.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/652900d2104cee46af84babccb214895/geboxotokedupim.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/50517302802.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/49192542423.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jq73v2goi9i2t0oh1nfj2b1265/vekurapetofupewafi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wibimupizavuzonimu.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/48417149269.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071416bd2793---92266907330.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/64154799287.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b545dcad2242b0ac03ae3536c3155502/10778492003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+combine+multiple+pdfs+into+one+for+freePDF link annotation
    • 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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 10936 bytes
SHA-256: 9200b4ea0b3ee9501a2b3c0d0832c22ea934890219c438afc180dfa93e4aa7bc
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 17824 bytes
SHA-256: 5fdaad2928fcb6dbe990daab25ee7e47fe64a2839d70dd6e559015d96d4e1ccf
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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