Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc23dab3f70958c…

MALICIOUS

PDF

130.0 KB Created: 2021-09-01 23:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c7b4684e666348b8a0dc34536f07b15 SHA-1: 875e35af4adc12ca0a69d13d0809a72785ac0a15 SHA-256: dfc23dab3f70958cacbe55bb5e900539c6a79470d7ed8b6264cf9a8f052b58fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The primary goal appears to be to redirect users to potentially malicious content hosted on these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612b0de080c80---39949526217.pdf In PDF document text
    • http://studiomanzella.com/userfiles/files/kasalurugatogitepawof.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/17035686465.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/62df205425ae2ae08d083fd8f70f6fba/75126832510.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/lebofibukasodibitajexor.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160839f9e03a8b---37810794354.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3ef2cbca8b157144f491c02876355476/mugarew.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210517050911.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d544e1cf3---dakonobosid.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/ruxetezosebasakixiwivaler.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/dominopaxazozeju.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4138cbca7---31600691126.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/rumuborakare.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/gebezatesameveredilikedu.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///morevurevitoxigetazufe.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/0jv3ev8m68v79qh28a9a9lh4pf/tipupe.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vapapotapofewerijezuboto.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/34083792864.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b9cc5ca4---25225868314.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/34162476520.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/vofisibamisoxigomejis.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160956eafcd241---tarebebexoxivigoti.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/47868740d6f420ad2441752337ac7194/5254516777.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/62678379845.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110523da4218---jarewelomedawemenujiwaxin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+can+see+you+lordPDF 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_off00018fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA8 23072 bytes
SHA-256: f7150871ebe250de0a906f4525ac2e5c1663048ab48dd8ac2c61f95a49a5c921
font_01_sfnt_off0001ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E293 10340 bytes
SHA-256: da59b84430677fcc67255d955f6359ef595edb7ab2bc8bfd19f844528915ff82