Malicious PDF — malware analysis report

Static analysis result for SHA-256 5936151230df5e38…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 03:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c51af1610a8584c14ad8f005c52df1c SHA-1: 2c7f5ada7a0768b94226678aa611969794e422d3 SHA-256: 5936151230df5e38c5363909d4ef3604c0b92c601d145ea31addd2773b079635
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a malicious classifier and ClamAV as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a tactic to host and distribute malicious files. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608430029db81---43705284506.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4600c8c66---26444441979.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/u33ouccrjebbf4lpcqjkvbcnrv/gemiket.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/90403430430.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/a4a8d5b6e208c0d6945e478a8e48ad22/13046389622.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb5c98c972---losixewelala.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/mawoxefedubanexew.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/nivopares.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/mobunegapewopotitugen.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/68148168502.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47495c3479---42927427446.pdfIn PDF document text
    • http://gyobel.it/public/file/84876085841.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/dezobapa.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/35bf3175cf23e70c86d27b45c9910a6f/witubiliri.pdfIn PDF document text
    • http://garderoba.sk/images/_file/ladexiremulibavet.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072331c1b292---kiperomotukifanefapazuji.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/45776526986.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16095f1b54db02---dufita.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/49057945256.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a57c79323---wobesudorukafujasiwoluneb.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wunepapilezaf.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vapanuwowemukabuwurokaliv.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3583a5d13b---nilezajedukapikum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bed+bound+meaningPDF 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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 18760 bytes
SHA-256: e991d8f222414934440ecad6075b1b6103b8923576a5eb9a9e0e1dbeed7beb9b
font_02_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 10472 bytes
SHA-256: 0fe3e5cabb434af4f0a667700fb77a7191f3bd57d7a44e685c775c1697c635c9

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