Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9b2afb4562b136…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 15:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 942e08c139815a9fbfc7ab868bf74568 SHA-1: 4121ef74d64f1313e5cc22442559bb6db43e010f SHA-256: 2f9b2afb4562b136ad44502475658ffdf9a160f9e9b0c19a08e0f479be347bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, suggesting a phishing or malware distribution scheme. The heuristic firings related to link farms and compromised CMS uploads further support this, indicating the PDF is likely part of a larger campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://oniceh.ru/uplcv?utm_term=miele+dishwasher+manual+active+sc PDF link annotation
    • http://chothuexeninhbinh.net/data/dulieu/files/54303257075.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/nei0m7v39rd0ha69jl9kp5fa67/48177852239.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/bagegonusetaleruzup.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210811105112.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612438a668cdc---xexomunudadebuliranot.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/52f51e306aaa54e2b9fea6f04c2f4e72/wemojofinukadadekuvunux.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/69870226188.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/984b5ee853a7e754c06d22031b1f70e6/lenomivazipaluzewitojewul.pdfIn PDF document text
    • http://tano-cable.com/d/files/85871688800.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8ae014525c38315da966ad3c89144977/28627779974.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kuborel.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/dd0d11859251a9f0cf40daf5ebefd303/gaponevudag.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/bawuvikifenifizare.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/wavezijigajagabopa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160916cbe98e7f---zoxadimuneza.pdfIn PDF document text
    • https://www.naturartshop.com//ckfinder/userfiles/files/jaxaxu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c847915b3f71143f6bfcd540b0a4afde/bunejemusipakozader.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/wokidumiw.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3c75f24d078e8cb92956c462ba316f04/guxalom.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae22f2cda7---34932409806.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/014d4f7306f4bb55ca913fcd3010e234/27780883705.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/1475c66ad7e0533f7ec7ea51b2fd4927/36639291853.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/50314002681.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf280703d---69258744931.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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 17980 bytes
SHA-256: 9e335dd4243a9d24abd89e0e9728b7c5433fc558cda7280914f531b8fcc6137f
font_01_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 10760 bytes
SHA-256: 2942e1b0b8cf4255e0c02e3020155e9c4b66c743bca413386f250b5da8d880d5
font_02_sfnt_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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