Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3323bc74b14d40b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 17:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57bca6c2544b6d25e3cec932106a8938 SHA-1: 7da815bef7502393763d8de3494996e455056d8c SHA-256: f3323bc74b14d40b3d47a54818521ca77784c1d33f97a19635448dfbd03a2193
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste content into a command-line interface, a common technique for executing secondary payloads. Numerous URLs pointing to compromised WordPress sites and other disposable hosting were extracted, likely serving as download locations for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://pattarasawat.com/ckfinder/userfiles/files/putumuwixafinitalexojad.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h3dc2m8fd7iclo6r26vbsdv7lk/xubuw.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5ee08ba05---67936502955.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/53453141876.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/kubakezitifotafexe.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/xodivepatige.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6106ff5b0b02273ca36678a462cd7cf/nedilataposawanag.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/4ljj9ar9k3vp3mhqnfq4pc5ddq/vavonodob.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a62aaad909fa6529658f1fc060474c9a/nakikasusad.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b358189804d---51108255986.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb3ccd543---jerazeles.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/69978022206.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/mowome.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/bokusisufazagigapituzap.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/makagudawidasafojubusux.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/tgn3l66r2lh84lma02dol2d19m/suxagamatudakudalageneka.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/aadur861rcuunqt9uejp3gnejo/tamaxofa.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f36178673---20239760267.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf6298ac4e---sonadut.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/57219080570.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/penokaxeruweg.pdfIn PDF document text
    • https://www.crqp.ch/ck/ckfinder/userfiles/files/64147492285.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/vadeb.pdfIn PDF document text
    • http://asid.rw/userfiles/file/66462798632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=decentralised+finance+cryptoPDF 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_off0000cf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 16908 bytes
SHA-256: 6e64898b0f0da2c61dc53f358fe587f2d7871f56aceb20e69d05b07fec7c8547
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10728 bytes
SHA-256: 01b5b491febf503c0b7e4032897721e7936899eeb69c982aa8b4101c247a3cc9
font_02_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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