Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cd9a3343618e89…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 08:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3170f2a0628ba36c3183f91f948b3b1 SHA-1: 4e477087ab94730b154b376d7421ffe73cdbb1a6 SHA-256: 93cd9a3343618e89e36fde75023557bbfda41419728a5ba139486d22d3a4d613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with multiple URLs pointing to compromised CMS uploads and potentially malicious PDF files. The presence of a 'call of duty mobile update apk' in one URL suggests a lure for game-related downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bursakaynak.com/userfiles/file/lutez.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6e7c8023b---fowoberobudamuva.pdf
    • http://autoscuolapezzano.it/userfiles/files/kinizononexunolubijewu.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/boputevuputofuj.pdf
    • http://kibbkw.com/uploads/files/lefawizenaluselefejuvuba.pdf
    • http://sinojjacob.com/userfiles/file/18260344050.pdf
    • http://drprdesaihospital.com/uploads/26680660978.pdf
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/55476011249.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/donefizuxugofavusuzi.pdf
    • http://birkhoffhi.com/userfiles/files/sinomunote.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/pogike.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tasosofirinog.pdf
    • http://windmill-bv.com/userfiles/files/rotukow.pdf
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/luduxirenimiduwikoxiziwix.pdf
    • https://crmsaas.dswip.com/ci/userfiles/files/lazejimerodojenevo.pdf
    • http://winkeleninzundert.nl/uploadimages/files/zumabujewejuge.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fcc6189618f7971625fd5fcc25a43b19/76896393100.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/76334012051.pdf
    • http://tentauto23.ru/ckfinder/userfiles/files/nefofekozezuta.pdf
    • https://labelmarket.pl/data/file/87987185495.pdf
    • https://eastmangroup.org/ckfinder/userfiles/files/mafaxeronoxadimaxizivuxo.pdf
    • http://learningkey.org/userfiles/38844494260.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1fddad95452a157cb98bda570965130/86566092043.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=call+of+duty+mobile+update+apk
    • 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_off0000d971.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 16792 bytes
font_01_sfnt_off0000f183.bin
bd1916b8a3140c6e66ebb579acba831ea58a6778af01b2277814e55913393bca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 18752 bytes
font_02_sfnt_off000121c9.bin
6833e713a7c5bbfc960e2b86c65d232c2e23b1e52382e85e6a94ec2fcd669f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 10764 bytes