Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f48dcfac1ae613e…

MALICIOUS

PDF

87.7 KB Created: 2021-07-26 03:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 191be1beb264865f0e0e6060151af593 SHA-1: 183cadbd14ce8a01a5c545f8636975345c997f8f SHA-256: 4f48dcfac1ae613ecc04e5564554e72813ed3b0fe7ef27e9b0ed0ea38ef2d23b
176 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number for fraudulent purposes. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick users into executing malicious content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0aa6e41c083411bc896d8205c2d116e5/metetikebumivivikuze.pdf In PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/xeritapitegogobizima.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wikepuzela.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3f76de6e---direkuva.pdfIn PDF document text
    • http://cakenepal.com/userfiles/file/xijuridafojozo.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/wulega.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052805070370554.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/69003702151.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc14c9fa0---bajawipefunadawuwodema.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a05374dca16910ad202ae5385fe9b974/pazazotigurazuxo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b317cf33927---39330403760.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lipuxilax.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757f56c1bbd---34000741290.pdfIn PDF document text
    • https://digireg.pl/upload/sobotofabik.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705eb12ddad---42812417679.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tovapiwikokim.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/86239685699.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/ditudavamuxupusejejebive.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/dujakosazekotatenonenunav.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607048d033999---34996280827.pdfIn PDF document text
    • http://dd-eng.com/files/files/40504130433.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608895cfc4c61---51786071309.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082aaa6aa2a6---femikulilaxi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/af00afc674fab19c678f6516c4165b5d/samigowi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0c048cd7b---narebubudedobasaxavekotu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/65i6n99qsvf9l9mhiel1p991t7/13953638447.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5efad522f---79007946296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+inquiry+reportPDF 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_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 17780 bytes
SHA-256: 10700bef77fbd99a72531e7c312faeb7298db9a9825451da1fbec240bada9b03
font_01_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 10728 bytes
SHA-256: 013e89b94e765f9a5ff78f0761d30bc9505676f12dbc0e73c7875f3002485361
font_02_sfnt_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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