Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b37411d51e6197f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 10:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 529d6f91660485898c21f544254a8428 SHA-1: 9bf7c09c5084e74ddd2d0b2bfe7924ea7d14caf4 SHA-256: 7b37411d51e6197fe2c2d2ddcc68199bea94e017ccad8308fa773b3dfb2ac584
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=how+to+get+updates+on+android PDF link annotation
    • http://cdn.eagle.mn/uploads/userfiles/files/6222797003.pdfIn PDF document text
    • http://come2menorca.com/images/file/watoderukemegojabeno.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba46c03f---nazovo.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/kekeg.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/aumr84ptop5pfn8setkpmupj63/69426321171.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210915_BD142EE84AB73CE8.pdfIn PDF document text
    • http://geasit.it/userfiles/files/gigegofivadajazewusajudi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136392484dce---kuxejelidax.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/46257231698.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210901172756.pdfIn PDF document text
    • http://hkacca.com/userfiles/dibedumupidet.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/mokuzok.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/zamem.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/molixosopozotodulow.pdfIn PDF document text
    • https://tckontrola.hr/files/pifosunaxajusibanodo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6d8df1ff---92134625068.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316c046283---loxoda.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/94459157320.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8ce7708fe---84561884224.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139851cd6e6c---moridul.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/62344603769.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/714998689.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o1k8uceqrjccdl29g0u1qsngt3/saselijovogutobivoropew.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361c138353---busuxotilen.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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 10700 bytes
SHA-256: be4d27328268b4780a2b7e170b0ec935615baebcbb09f686c212a4cf87984bdb
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 18728 bytes
SHA-256: cc8fc82cfb27a9a230ad3729a04c91eeccec161a3313332c23ea759962c4679e

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