Malicious PDF — malware analysis report

Static analysis result for SHA-256 40562c8e84f6f45e…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 08:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 98184ef57630879382552392939f4886 SHA-1: c854dcd4be7848e33d8ec0b0ea86fd68cb929759 SHA-256: 40562c8e84f6f45e5bd7370bde45b6858e46a2b5b5ba9490be357fc3f49ba0e8
196 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier. It employs a social engineering lure, instructing the user to install a browser extension or update, which is a common method for credential theft or malware installation. The document also contains numerous links to potentially compromised websites, suggesting it may be part of a larger phishing or distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • 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
  • 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://dhs1959reunion.com/clients/871764/File/71711958687.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609112923238a---dalobuzonunuxiwufagisek.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/7321930712.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/kasosedarekafupik.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/lenomojudi.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/terurigidun.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef1df3c14---vewotojenogugix.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc0d370f8---tagusevodotojogugafegekek.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/60f975457b4d5527e235d6a07af8291c/12566177786.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e982c5ea19---30136132354.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/mokururawuwozizalivon.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/25458720589.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dv8t0nm15vevq1qji9ibf420l5/pofomuzotisujawudit.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/dajumorurepi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42911ecc1---sosomejomejitopuf.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/75512967345.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad246f3d6e---jirikelejafi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7614b507---53483695117.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/pap2upfpbg3kj9i2g486b0ooh3/mitifagofo.pdfIn PDF document text
    • https://bloomeng.com/uploads/66475078727.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac81cd41cd---dupemawotabamesafamunituf.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42e59567d---wimef.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9ba1e4b51ef5dae48cea30e6a753b684/34994943684.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/67934035206.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1e6c0c53f875954748be4f27bc6b7414/15987936250.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2ece30e4---giruxodokenutuvuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=input+placeholder+stylePDF link annotation
    • 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_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 10684 bytes
SHA-256: e8a718c9dc9c521988587eb33df4f106728c32ee1ea9bf5127ba595408c30184
font_02_sfnt_off000139ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CE 17312 bytes
SHA-256: b687f4a589d29b579a63a52ca1d077502aa41d38591a9163f952661e87994dc9

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