Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6b4093f5fce60d…

MALICIOUS

PDF

95.4 KB Created: 2021-09-08 06:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7b5c11bc076e081d4f5bc98e2899453 SHA-1: 6d64efa490cc14658518a93aff41db4ecbf95725 SHA-256: 1a6b4093f5fce60d5c828397ef3b78ecdfeb177f17a6b40f2a05f4ec0c0da404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. Numerous URLs are embedded, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself is also flagged for containing link farms, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=transactional+memory+pdf PDF link annotation
    • http://geerhannutpourreussir.be/docs/upload/files/18150336888.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/t08e1lbtvqdmjse1q6i97k4hp9/diwijiv.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/13282173683.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/37492994685.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089252164c51---87583779963.pdfIn PDF document text
    • http://enricobarraco.com/files/sijebudagavipeda.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/jajulodejorigel.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/37044421561.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/rosat.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/6a8043245e3a9471abc5e218f951324f/novavesawaluvobuvefisom.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a38034a86---depomime.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/8mn9bl3hcvv886nm3u4kjotuc4/pupilolowo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160adc37eb5128---6316154728.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fbd8af9d---rezorixomukavegumare.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb608e6195---97847832342.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd0b634cd---mosofe.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b355dfac---11401110353.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/84475151068.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f1ed6de4---76679041542.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/xikijadanujorufuraxedewip.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/71388450042.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429120128169.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bef6995bf---99667955024.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_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 10860 bytes
SHA-256: aa46ec3528de7ff301fe54e565b90afc248cfcf7cf5210eec9ae3f7d6f634237
font_01_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DED 19120 bytes
SHA-256: c3698fe06f966637fca77064249f7c3359f71028baa0061d5886d7b08318917b

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