Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8674239aa9f79e0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-22 10:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f76bb70325823081903c1219496b8e16 SHA-1: 90ffc8816c3b130c2d8def495d0c2d5ff196606a SHA-256: c8674239aa9f79e0026807e9a599afb771f24ae3210ef54a0d101ad069f267ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and numerous URLs point to a malicious link aggregation pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=how+to+create+pdf+on+iphone+from+notes
    • http://3gr-group.com/ci/userfiles/files/dimigoleponabumakekoka.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d0803f8b0d656018a882d3c8867afc3/64665340201.pdf
    • https://pannonfinanz.eu/editor_up/piwalefogozumekotame.pdf
    • https://vanphongphampmc.com/upload/files/65887723677.pdf
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/83681499710.pdf
    • http://kingsap.com/file_media/file_image/file/gusutavamoberi.pdf
    • https://sardavetri.it/userfiles/file/fotelog.pdf
    • http://ibrahimalsada.com/pics/file/8812588933.pdf
    • https://myphi.biz/nbloom/fckuploads/file/pamudivitalesupes.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903160106195508.pdf
    • https://ketdoanbus.com/webroot/img/files/14089961140.pdf
    • http://eventechsite.com/files/files/31871400811.pdf
    • https://lostfoundglobal.com/userfiles/file/miganejozavemotimagutut.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/nobives.pdf
    • http://chinazzjx.com/d/files/111310202.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17d606b95---wijexe.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa866bba9---31220692078.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614190e8d6b23---xugofedugojigofijofixam.pdf
    • http://geose.ru/userfiles/file/vaxotunen.pdf
    • http://groupelamiri.com/uploads/FCK_files/file/65004242014.pdf
    • http://tunecharts.com/userfiles/file/wawameladikebefopekuw.pdf
    • http://solo-reisen.com/media/images/file/56793213430.pdf
    • http://kd-council.com/upfile/files/poloxu.pdf
    • http://reclameindex.nl/images/uploads/pumulo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd14.bin
36ed880a10ba5a92d115edb049bbec90116913f2f8e352f3b6f673af3e2ed9f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 16184 bytes
font_01_sfnt_off0000e67a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 16792 bytes
font_02_sfnt_off0000fe91.bin
cd534bc4ded1e47be5e70e79650c6e59df2698c8d0cc85ffb2231721946876e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10916 bytes

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