Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4e570ac69f8e75…

MALICIOUS

PDF

93.9 KB Created: 2021-06-29 17:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3955b5f79895e23d1c65d8c1a9b480c6 SHA-1: f634a516a892164b1bc899d7bc8301b306ceb3c1 SHA-256: ae4e570ac69f8e75bed514940257a979649d125d50ed4a0ed431d7071aa62b0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, presenting numerous URLs that point to compromised WordPress upload directories, likely intended to lure users into downloading further malicious content or phishing for credentials. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5d1ff6fe209269dc8a109b59b5ba262d/56026765236.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945dd02393f---gedolizuganuz.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53d5f1260---54268332842.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fad5dc1b---75774541700.pdf
    • http://heyibnb.com/CKEdit/upload/files/bekimewuduxu.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2bd5b82---14001187079.pdf
    • https://aawyx.com/sites/default/imageuser/file/noxawunud.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607910f48cb41---23583038459.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed85776d86---74893108417.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/geruwozasasozur.pdf
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/18783514096.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd73dbe9bf---72352964879.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/aaafb33a4866ce98c238070d0d047d33/30600606097.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d96bce26bbb36884f82ea706cdfd24a0/mawuwim.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/winoranaw.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160793282cdbdb---63563825210.pdf
    • http://phantasos.org/userfiles/file/sedejuxuwujowaxedi.pdf
    • http://bigsvatcharasith.com/userfiles/file/14420097808.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb1bdc858---lisawunizalikunanareb.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608df6fd08c86---bofozetijej.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/49t73rkta2kf2jeba6sdr31u45/gaforisi.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a9b79f7e---xukifo.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b728f663574---zarixomosa.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/dd15c7dcf0395df3a5c0c4cbc2684d9c/romodukodegexujus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+way+life+goes+ft+oh+wonder+mp3+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef62.bin
f88f3c5fe7e80ef2dc66ddaf0b11c0cdb1a15c409ccbf60c8d6ee60ca724d52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 11280 bytes
font_01_sfnt_off00010991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 16792 bytes
font_02_sfnt_off000121a3.bin
60fb8a05079e00586c0d5db233913dd07f63c9f889c330fcb925d2c34a9875e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 19656 bytes
font_03_sfnt_off000153ac.bin
11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153AC 16228 bytes

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