Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1a6b9431d30a94…

MALICIOUS

PDF

84.8 KB Created: 2021-08-19 06:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22af03882356029bbdd5052231b3d8ea SHA-1: 69462206bfc1fed82069ebec1978ec8f0764b5e6 SHA-256: 7d1a6b9431d30a945b27af0fa08aae00ec2ef3a15983b0933c29b92dedb815cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves exploiting user trust through a seemingly legitimate document to redirect them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://philabc.ru/uplcv?utm_term=protein+structure+pogil+pdf PDF link annotation
    • http://capableapp.com/uploads/files/vutiba.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fe7b92755---sediwezedezanorukuzep.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/11665688149.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/54468922540.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/nokozaz.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9o2qredqn0p6bh7krvlosijv83/62893718839.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-15/images/files/vuxubobotuza.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b677b334ae---29489854054.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/77169382706.pdfIn PDF document text
    • https://kawanmto.info/contents//files/sukuzixudi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-25/20210525154814928386.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/japokatavosileroja.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/72100630998.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107260048479509.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/9374168209.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e664c9acb---32219013343.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a453184dbf4---sorito.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8d925c6073a2f2c016fa69a4ebc32e68/gusigedinujolasixupoge.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112834168ede---xamiboxutovogutofebajovet.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb80a1fd7c---wifanagirizududika.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/68040442320.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082941833ce0---67549262430.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b441722a70---44416933601.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/211d65d86c76ff01ede15bc236f5ce00/guvavukabo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f724bc0c1f5---rixafadarit.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/vivalipatimipumil.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://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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 17648 bytes
SHA-256: aecec8efd775679f35da128b43560d93d73b1a56ffadcea5569226a267ab3fce
font_01_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 10732 bytes
SHA-256: 4b3c2cae3079e622966be72526946745d9ce5b11780afbdb5e277131d7947f32

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