Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d38c6ebf67c685…

MALICIOUS

PDF

89.8 KB Created: 2021-08-08 18:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a09c06473e2ae80a5fafe138bdb9d6f9 SHA-1: 0c0d0c367291158b2ba541e9295507c52176aa57 SHA-256: 37d38c6ebf67c6857bcc0a668db62af43d6dcca88f364240d21aa4947fbf9f04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, with several hosted on compromised WordPress sites. The primary IOC is the URL hosted on 'aliancegroup.su', which is flagged as a compromised CMS upload. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0cf68a00---99581899813.pdf In PDF document text
    • https://malashealthcare.com/userfiles/files/febenopitojajibejaf.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/musegitatafizasu.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/47129627356.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g8d59m6onuqietsb5v2o34lle1/piror.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e7ecb3887---35705014542.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/19756403477.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/950d3bdc08f13cd3ace2837acd8bba5f/30153982367.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080659780394---walokixaduwijekaw.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/bujuzituv.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/6980517869.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088231176f91---kegasipuvebibo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d9babc72db616220928f044f7ed59e26/95920660828.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/147e312e67cb065de8b716317d4943c4/8736949385.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/nmioktfvm4rh4p7oap5366193h/kotesewar.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c42726129---27957557086.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/legilagudejo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/117b0cca3989087cd6ee388e97a07d23/dafigibunepivevutarututub.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4bcb6ef9---593014800.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/gegipazoruf.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a86023c12---14065309616.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/585b1d6a280e87b41d8b9b8e5e6d7a08/fojukuvufabojavonivoge.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/30314487801.pdfIn PDF document text
    • http://domplus.su/userfiles/files/36981047821.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/latubotojaba.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951b1063143---kametimekaxuforanibedusor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cosmopolite+3+guide+p%C3%A9dagogique+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 19216 bytes
SHA-256: c3930b32b02941ff56c877abb61d80f4bb6b809e46da376d2716e6f9036c6c88
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 11240 bytes
SHA-256: 06201a388fa0dd70140f962568adc7f702c3605a6870097a456e5f9c154f4e81
font_03_sfnt_off00013e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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