Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4445d5e524a0a6c…

MALICIOUS

PDF

84.5 KB Created: 2021-07-02 18:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8a12b6c7870601f0199056998a0ea374 SHA-1: 7fa177dec1e9e898e58f6c5717e2ed77c5db9637 SHA-256: e4445d5e524a0a6cba4636ab3b6aaefb8ab01cca8f3ff0fb2682bfb3518a5c96
176 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve as redirects to phishing sites or malware downloaders. The PDF_URI_IP_LITERAL heuristic further indicates a direct link to an IP address, suggesting a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d5dc69e6e---lumirimagubafef.pdf In PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/11174556369.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8212f10a4---vulanigikudipaxajoradutad.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/tukokerupusonujizom.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/rujip.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a308f718b6---746095447.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/34824770111.pdfPDF link annotation
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/02904140bae68a8645351d70e018ee34/ramukesonefopob.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/jomutasivitixi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/44bb43263da8e1014c175a9d9730838b/vonazekonojoz.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c3907093---zifafuwaw.pdfIn PDF document text
    • https://tavio.ru/files/file/bupegudovolakogivupo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f148d1861b---66597157046.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/35120601323.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160703fd42ba38---61741424884.pdfIn PDF document text
    • http://mextro.de/upload/files/49715977206.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160945f333464c---90016499561.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a222948a50c---vilip.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8190a0eaf43840ac7aae3694f0a2ed7c/jesulumojizukivigitumob.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/10896280017.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609841852ec8e---gupobixaf.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9156d21c---65173240060.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e927bd88e---194395634.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6957314e6---bakebipobozoxufekuvapak.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f35c50485a8d8a6649ce2604c4eb8fcb/lenupunipotudikijabaziluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=piano+songs+to+learn+with+lettersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1b87779219c9d1700fa972c2bbd75fc5/60741165878.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_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 17120 bytes
SHA-256: 412d485c32a4dd8489b44d0349daee885b76499839935bc37da24387aff85a7d
font_02_sfnt_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 10472 bytes
SHA-256: f0b785d2258a156235cdcaf86a5a0202515438b8182fd63efcfa1e6f633e6e46

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