Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc21f16d976cff55…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 02:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: db42a4856a04bc34d683d54fe19a7ab7 SHA-1: a5c07bc4ac5175c6507ea5fc43f5252933c43453 SHA-256: bc21f16d976cff5584be6bd5daf9bda1afdf416b2e1c07cd308d38aedd5ca660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in phishing or malware distribution. No scripts were extracted from this sample.

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://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/fukuririkemofepoju.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c256a4f195ee168b8da2c5031de2aa4b/kagizozogozerudovimupeguf.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b94e0710e060d1e6457ce79bbeb00edd/vesadurudirajebesilaw.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4kn42u5fvlrtr2tdt23gi0dhp/21340515578.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/42046842625.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/rafapivivali.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/zusegagagevurananazas.pdfIn PDF document text
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/55504706133.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160817fb70328f---dikobaxuzidewupoxetigim.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075b902a56f9---delafisununar.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/cjehcr6nugds6n5inerj1csu10/duneja.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/24fc8654f92652c20569abd913885c7a/magotidex.pdfIn PDF document text
    • https://arerp.kr/data/file///zeberugobotajibalexelum.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4a68ddd297f9ed86177c66df4386d7d8/40271873493.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f6d26aa59---gifikiwuxotitoj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vlm3ivjoaqtrlclri8khtu6sm3/59467726770.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/iu61uqsje9mhfqpae7s3qh2k27/sotasumoxurefa.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2bb640368640bae35130136e4d52983c/92496230631.pdfIn PDF document text
    • http://ndt-ultratech.com/files/35669086351.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d657901225---xowomuzedumiwadivo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/23c88fb90afeaf694c856c3335e60ab2/49474863792.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/pixavuwivovexujitoladowuf.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062312302270554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=suffix+meaning+deficiencyPDF 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_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10676 bytes
SHA-256: 42e354eed3a279a9bdb4c533141ec85983ab6f656bbd96c4546b0f7e30a48f9a
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16992 bytes
SHA-256: 80ae2a6cd69b49c9ae820f77cb3def08e2eec521462b7f27efa75c4e4e7241ee

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