Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a94b37e18c04a1…

MALICIOUS

PDF

115.0 KB Created: 2021-07-04 19:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cde64a33458fd34b19191a8dbf8ff2a3 SHA-1: 029a6eff30abb273f41f15d79ed55c69cc2975f8 SHA-256: 59a94b37e18c04a10f75d2d25bfc023933551e9abb3655e3282dcc8968882f53
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic further supports the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48d394ab1---bitozaxijotoseputijid.pdf In PDF document text
    • http://157.230.241.115/image/upload/File/29865119316.pdfPDF link annotation
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/zuzarotosekevaja.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/53900503229.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16098113b56b2c---zefazexewefufus.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/sakusenetegejuweronirujan.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/segusolepeguvukenupuma.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c71c199f6---lunozubewexa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b34253cc584---82675028421.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb830a2a5---48860458515.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///34992352740.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d775a0f6d18acccf2bf83e4ab8dfa63f/dofuwasowopelapaxifokof.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ad99054176f1f0f1c6727eaeb3a15c0d/morilujusidudexejif.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f07fa7f468bafab13fe6e69ee799cc5a/lelumigus.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770a0c8a929---82802882491.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tukanejuwolabifonuvito.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4sa91ta83hmo1asvpaqgno9mh6/gejezotuwo.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r70n2m7f11n8v076mhmk76rv91/36626465357.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/pejigikarudijunajona.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7gchk3mj7kpvbea30loocio8r4/zonaxumabew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+use+pdfeditPDF 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_off00015f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001778a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1778A 18468 bytes
SHA-256: c196ef367462ead95af32566c0f2471c5da388d837531efc18646693f4d51308
font_02_sfnt_off0001a7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7EC 10256 bytes
SHA-256: 50e9fbcb175d870023db81d46092ec068b1a6e4a60855e4d2fbc356f3df7f395

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