Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fd85d618bde5bb…

MALICIOUS

PDF

81.1 KB Created: 2021-08-29 09:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2154b6a361eda7b06626aad03d7d77d6 SHA-1: d3356bf80506986bf412f23405a81a394f2f3c76 SHA-256: 62fd85d618bde5bbc444c567ad3e9b76631a9e04a3b7f22e79387c9681435e35
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of multiple suspicious URLs strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://queure.ru/uplcv?utm_term=no+xplode+side+effects+liver PDF link annotation
    • http://birzebbugastpetersfc.com/files/file/somatenagojono.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/guwotosajaxunigevig.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce7667063---zegezumi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3c503e41---zepetebevoniwenoju.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd89189cc---35727507290.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/bisojuvizibokomumizizivin.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/74728603559.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081137a89783---4279594544.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/verovimenupo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/figovifajufudojevad.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/33c2lht8n8ipvegpr8k2vs4anq/medilagikakadeweruxe.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/97282128085.pdfIn PDF document text
    • https://camelcarpet.org/d/files/89537293353.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/99976308275.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/biruxoxefijefu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8deb391f76---nifezolusepenatimasux.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xamowososufabafaveremap.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e3d4d56a40f2b61e2c7cb40123afd171/42573309464.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482cf78bf8---34316435851.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/42085991528.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/pimejaxapowi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/706969b2daeadd3fba9c30c3fc82f843/87617473101.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/88bdaf6e4d158909adbbe3956893932c/wubovevagilalumapez.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_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 17556 bytes
SHA-256: f82a7b7231e47b0189375b49469c70086e55a9c698d5b11519ee491c5c036f97
font_02_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 10492 bytes
SHA-256: 129041e522d4fbaa86c5a115a64b6c484a62f9500c00494286774a7e0496a2ce

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