Malicious PDF — malware analysis report

Static analysis result for SHA-256 5511d826ddd7a19b…

MALICIOUS

PDF

76.8 KB Created: 2021-06-27 12:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45f7260152af910d982c09dab512a889 SHA-1: ddd19ea1cc4ef9937e4f9e2ce887f068d09233ac SHA-256: 5511d826ddd7a19b5b95284a1c4419d5fbf4d81bc99eef645a230fdb8e8e934a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://partnerplus30.ru/images/fornews/files/pakutopadad.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/tsbn8ncurij73fjd0ho8hhepvs/54998368077.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/18835638177.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/904jus4e4ugpcc8v369cfnb8o0/46782791841.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb80946180e---39728282783.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/pidematixiwoxekapujulavib.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h2he8vvgmdtfm63lf9s7rqgskk/gifugigelaw.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eecf890175017b3db326a66fdc862fb6/95824387086.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1ec603d055c18b165ce39c838e469f4a/17890413014.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2c4f4ba7a45a4b2f92854b9b554e62c4/vusokemebufotirunikasu.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a468be1bcc1---leganebiduxowuvabijorivox.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30734520fe---bezaxajezenoretixe.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948141bbb17---41516899457.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/09f2f15dfd1f8f892e58e74cc3fa93f2/wirovemurux.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac2d1eaab---53973231555.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e4f4001e3c61df14e583ae2b59f498f1/rugukuvixu.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/ksqtgmvgq3s6vsv9jma5g3cktv/rijabudapaxobelogi.pdf
    • http://teormech.ru/teormech/usrimg/file/lawor.pdf
    • http://arunimaflavours.com/userfiles/file/23662984325.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607986b938cad---9597493761.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d29f2cbd7---fetevopigorinifageneva.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4d5968b06692365fd5490b220b944cb4/881739226.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5boff0731c9qcgtoqsqn5af1lo/nodunafemomusowosagut.pdf
    • http://artospace.com/pics/file/zasalebafuxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=letter+about+self+love
    • 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_off0000cc1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 16792 bytes
font_01_sfnt_off0000e433.bin
97f10dbd6e90e829f37a0d8627946aca64cb4bb74083048ee5b1ffa8a3775b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 10276 bytes
font_02_sfnt_off0000fb89.bin
cced6a7cfacbde612d5d1faa54a09297cbb1e194bf52d9ee422a8e2fe469a543		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 16508 bytes

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