Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b94e75df5ac7c63…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 21:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 33cae592ead831c98c3b104f34f5a11b SHA-1: 808cddc1eee097d34763af2d786c495f8d285f0e SHA-256: 9b94e75df5ac7c63323b4da628f5ff0e5242b2216aa3bbab7277a9a947f8d513
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://soalmatematik.com/userfiles/file/5224007655.pdf In PDF document text
    • https://bakotech.at/uploads/ckeditor/files/690878841.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35fb966a90---lilogoriwugebus.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/nineladotalorazisivenuv.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da0ef93b8d---kagojaviruvirebi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4436cafcd1a35f56f2760f314e85661d/jugegomisaxex.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v5n91ep04tdo2ebtcdr6qfi5p6/18905061680.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/bovizapekuvevorexexogov.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/15f5f7091f24607250631788eaa76f8f/2342576225.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/19742772073.pdfIn PDF document text
    • http://vodnik48.ru/content/file/baruwabaledubabob.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/bezawuzetotigado.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/dofuxudamagam.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f420b50f1---lenelozatup.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/xozazosezumakit.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/58280615453.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3319b44d048eb54961c681593fd4ba18/lixar.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1855101a9913e441ac9f81708dce4624/26166766417.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/letalo.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nipowabifux.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/46928918390.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/fitowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hisnul+muslim+english+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_01_sfnt_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 23488 bytes
SHA-256: fa019a071d0c80ab1c5b4ea3a50d03d4ae737286ccc59357fb31a25166ee287a
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000133da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DA 10556 bytes
SHA-256: 6936d6606a2fa14b6ae5cadf74195678a40767e3bac06f7f87629bf459f26e4d

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