Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a902883022bc50…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 01:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1572ff25f8c7fd505d5d425d3f4c9d38 SHA-1: dbfed8fe5d941631cfa279416344a72bc17c2e9e SHA-256: 92a902883022bc50fcf5cca7718f0150f1e59d05762370b503f6764982b5abd1
216 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick users into installing a browser extension or update, a common tactic for credential theft. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=drift+hunters+2+unblocked PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a19f29528---galuxuzu.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/kazagimuwo.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/magagojumixikerawejok.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nrrs1opav01q3fdogh996m1r69/77503571925.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/femogaxifexajagifamilaf.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/warowexuw.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908091546.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430773be9d3---bajibokutixodopewinesana.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/74890526842.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/foxivumotexirenipibaga.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/66050268454.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/gusiniruxoginidosovixujan.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3032402678.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/89092379743.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/raduj.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/famikobixebejafibosapago.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/79996858611.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161394de736f42---beniwesaxise.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/vatewokib.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/pilokubavotasovesakifi.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lanakibeniwalipiniwibutap.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/pewotematizetatukuxamim.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/sejuxa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09e1bdf21---nugevumazela.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 10864 bytes
SHA-256: 7b8dc56b2d067720c65172e33229c512259df7e1b019d54af893da4738e02ab9
font_02_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 14044 bytes
SHA-256: f965c5900b574c09bb31606d11a2e5f62ec5f6656e63cf49f41ef3e5992985f2

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