Malicious PDF — malware analysis report

Static analysis result for SHA-256 3676f9a5a757c18a…

MALICIOUS

PDF

96.2 KB Created: 2021-06-28 02:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dab39f9f22250beccf93d215284c158 SHA-1: 21c0c98e7827daf48c4d5a55af8611177eda9819 SHA-256: 3676f9a5a757c18a477b7a324b5db232747e73aba2ed447300ab094fdf8b3b22
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites. The presence of multiple external URIs and the 'PDF link farm' heuristic strongly suggest an attempt to lure users to external resources for nefarious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://philabc.ru/uplcv?utm_term=a+man+of+virtue+bl
    • http://bora.su/ckfinder/userfiles/files/95221816699.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089388247718---pufotonunofibimugupapazo.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/56593419195.pdf
    • https://betentour.com/sites/default/files/file/ruxumeziluwagezimepa.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd967ac9c4f---30404646106.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210610_BB8C032442BE5976.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e99b83ebe---doxibeminigoboseped.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ecaf21e21---22178758001.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jn6mpd78m1knr0p1ma2l5gha35/49563911570.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/423e5d5448d73833b32dbfca44e80a39/fesuzolururuloresodix.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/nowikuliw.pdf
    • http://ccforum.kr/uploads/file/1624176531.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1432710118a323c92ec235bc99bbffbf/57965841295.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89facceea---xirapiwopuwarozuloxivo.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2031c1e4---gironubiwirowasonogosi.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a491fe146da---90355660931.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c655160ec56---juluwev.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/262afc4468bcb412c95ed247fe5287d4/sabon.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b8f0b72cc10ba4b2d4d8dee375546db/figazud.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/e027d896ed37a832a9e25d59f91b3f0e/56438807459.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rv26ccqbvqdj2s19bqhqnji52o/visotasuwejuzabutoturege.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fvsqjbevge42jten9c336jqoij/demabes.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607978df39558---mopanokurumibonijuza.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/g7bp0ocsgpn7ipslaglck24fhi/3586635973.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8beb328d---33485302533.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa55.bin
f61800b5047e0d2aef063c4883ff8cc17c692741147ae780d8ddde00c462a1af
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16640 bytes
font_01_sfnt_off00011122.bin
addcc03b3dce7bf8f11a792d75d9e580cab9d2ea70484a62fc01309dbff0bc93
pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 10496 bytes
font_02_sfnt_off000128fe.bin
ae2588c11c251a5e55c69aedc34d6b8678c69814de6bd6c00db556396122c64a
pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 18604 bytes
font_03_sfnt_off000159d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x159D5 16792 bytes