Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f796f775d69b371…

MALICIOUS

PDF

72.9 KB Created: 2021-09-01 02:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2c0c7c607d51c8d1b09f9bf7c155095 SHA-1: 28daf86aa6802f124ee7b81093bbd80c8b1a2e2d SHA-256: 0f796f775d69b371b7e9ff341c4d73ef3821c751a06488a49063c837c2f7b37a
156 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. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d46bbf0d4---damaromelopogokasowilafig.pdf In PDF document text
    • http://rakkhunnursinghome.com/user_img/files/59090619979.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce1ac732d---73523626925.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/12309278033.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/25419801996.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ed4ca2d760---56092374003.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/narugomizipuvubo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092f635063fc---nijagexasukonetivax.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/53255762594.pdfIn PDF document text
    • http://axwelindia.com/uploads/mefage.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/taj42k78cn1no2t0in9q4ms3p2/87379268922.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xuxapiludatisobivoj.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1c20ugoe6ouucqmnd8u60l2440/26916234388.pdfIn PDF document text
    • http://cocoal.com/uploads/file/wuwugo.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/jutevabumifeko.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gidofikokupalurisafon.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/0aa587f6a7f10f5f2f57c50ff641ee98/25081284136.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9fdeaf257df04c84053058392ce149f0/susoxexufo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbf3d8ff22---tevab.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/sowuwudumanatopaxa.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/tolumuwemulefitezemerusi.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/67843551786.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a698fc6404c---moroxifibebu.pdfIn PDF document text
    • http://pvvc.cz/files/39478438878.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/debuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=maharashtra+state+board+12th+physics+textbook+pdf+downloadPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bcf2551336b638252cf5fec64131afe5/xopewumelej.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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 11416 bytes
SHA-256: c0565fdc66d519b0cbea5277f2a3624b8791db4a8e319eb8375fbb40a565d80b
font_01_sfnt_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 16828 bytes
SHA-256: b34245c248169a8d8dbcdec4d3854383984ba7572cf2888e9851463092993931
font_02_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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