Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d7c380b9726e71…

MALICIOUS

PDF

89.9 KB Created: 2021-07-29 22:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 27289744f17951bda6f17b079f04fdbd SHA-1: d4b87249042da1a03952499a80a23a6e300223a4 SHA-256: 73d7c380b9726e71faad59dcca93a8f67c43c9d87124227c8264fb4e88bdb12a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or tech-support scam pretext, aiming to trick users into visiting these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/992uqoa23h961fe51bn9epkn9g/kelutowovesitesi.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61ab409f9---tekatelavug.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0cd4068882ced388a5fb08f4af32569a/44087339152.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210626_A3A5C0F140EBE51D.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084928c92175---zabogififajiwasafapabal.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/86119599636.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f214f67b---68973117600.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e612c29c.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/xekabev.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34ed28894805f7a0255f4de4ca037537/43890726652.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/91790536072.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f56f19d23e59049e0f2f5463a7d5368c/padujejaz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0861989a2---nidipojevisivevulomozuso.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/13957487649.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/20371864151.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989310953d6---tenezapito.pdfIn PDF document text
    • https://securitydm.com/slicice/file/woxewus.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/rigivim.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061601451538.pdfIn PDF document text
    • http://xenangheli.vn/public/files/xubagerakelopevewapilew.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16094c34adc357---ratediwe.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/jugimeda.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/bazalifazeruxig.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/rojukaxixuxokiminafijur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=termostato+nest+manual+pdfPDF 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_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 18180 bytes
SHA-256: cf41f50a3d6c997dda16feb073e7409d46a1af25e30b3ee372db86e42b535d60
font_02_sfnt_off000141cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CF 10632 bytes
SHA-256: 5ff34bf0c69b16e9fe5c0e9b0842d5b21d742a63ef55ab1d4f65048b818dce16

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