Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37dcb5ce19ce517…

MALICIOUS

PDF

69.5 KB Created: 2021-09-16 21:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f26b09c2529541de5ec0ecc878ef2a93 SHA-1: 0bbfa3af58c7a226df11f022a409164a63188ff0 SHA-256: d37dcb5ce19ce51725aed433d425beae36818af70aea96c0d7f1813f71b44f27
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of these links and the detection as a phishing trojan strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99b10775c---13685724678.pdf In PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/42653080622.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/wupelix.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/98403040447.pdfIn PDF document text
    • https://palet-school.com/files/files/wopetixutij.pdfIn PDF document text
    • https://shevian.com/images/file/puzum.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed4781aeb---dijagizesub.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/zujugapu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614259c896c7e---54045621124.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/vidiwosotijirakupazodisa.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/18046bb18883effe169324cf263fbfc8/58093593870.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/remawixofodogotujur.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/vodepuzazilozowojikex.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9a774a2b8b766c05c14ac0ba777aef63/65992134207.pdfIn PDF document text
    • http://deltools.com/userfiles/file/wekazorawejagenasaxoga.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rkdm6vj5dbqvercvd4teke30dn/58777084673.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136760e7c0b7---8357745947.pdfIn PDF document text
    • https://adci.vn/data/upload/file/8922067180.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/kuferezifimefo.pdfIn PDF document text
    • http://coffee33.ru/archive/file/xofawivilufedanisilefaxu.pdfIn PDF document text
    • http://awards.nl/img/cms/file/98293314568.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/koneberuretibozigila.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/64501565536.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/bujita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=good+y+words+to+describe+someonePDF 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_off0000b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 10704 bytes
SHA-256: d025b7d232597790f336916e23bd46859831c8d3d52fefe3dcf163e1281e0886
font_01_sfnt_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 15080 bytes
SHA-256: 6494e996df6bdfc55a8b7722df9d5fdbc9a8cd00ea68d6ac0088c9f594b64374
font_02_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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