Malicious PDF — malware analysis report

Static analysis result for SHA-256 85268c975afebb58…

MALICIOUS

PDF

113.9 KB Created: 2021-06-26 02:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb8fcb450dffffad3f0f525413ded309 SHA-1: 785405a7c38b201736b5dc5f039aeb16c6da66c6 SHA-256: 85268c975afebb58b282bb052f78f575ed350882cc9c951ea8433b7e213fe1ba
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. The heuristics suggest it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The 'Remote-support tool lure' heuristic indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89d85e3f7---kosanipurijixorovazula.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a51700b262e---guxosivazepebebetebolor.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc3c2118e---sulozekuwesop.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/28a90f29387a63874473fe75a9395960/pexuwukikufixevuwufumur.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a4a4b120b9bd8529ce9744551ce720a8/sezozesefe.pdf
    • http://wolfroccatiassociati.it/userfiles/files/bivojejakeja.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-10/20210610011300217008.pdf
    • http://impressivetravelvietnam.com/upload/files/64957311987.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089217f270c7---rikifobaveworisodax.pdf
    • http://tafgambiatours.com/userfiles/file/rukijusajuki.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798780db090---49231459552.pdf
    • http://policylic.com/uploads/files/bejupijo.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tldag3vhfeaeukacdfgbp0jigh/83423524836.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/waxuwojunikederuvosit.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905cf09800b---36658337113.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0e0627204683525328c40883c7f971b7/53913139828.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a6cbd736---43923663668.pdf
    • https://adepotcustom.com/UploadFiles/file/20210508221831151.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/30583017228.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160707e962235a---zavesuvasisoda.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160927eae33a50---79219728745.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b9e777f0b---75751652568.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd01ae5507---nabodikigodovubapuken.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/dcc4bc236908d7ad5164b2d3749c2b98/1877948831.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec7c82be8---76938402963.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=low+mb+subway+surfers
    • 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_off0001479c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1479C 16792 bytes
font_01_sfnt_off00015fad.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAD 16092 bytes
font_02_sfnt_off000174f3.bin
4acebc2e8fb81ee988e7fc0f413fea57ce940b9b1d5478537b49f79b28922c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174F3 10432 bytes
font_03_sfnt_off00018cbc.bin
0edd56bcad8323833fe1c4097ebecdf0cfa608db07fce90132e48b2943ca757c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CBC 17492 bytes

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