Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a9d71cbd65b518…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 19:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 145dfdc2c017d08ff7df4e3956d927a3 SHA-1: 96bfc4645cab020dd4a9252af13f6c600b55bbcb SHA-256: 34a9d71cbd65b51818d97afcc5c86d009d378c675ae68954b7e139c6b9cf69fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and a link farm suggests an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=john+ciardi+how+does+a+poem+mean+pdf PDF link annotation
    • http://www.asslar.de/downloads/dakapeso.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609985ac0f725---buniwivozotovugivapijo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf3fe31472---morafajivodunoz.pdfIn PDF document text
    • http://mega.kz/media/upload/files/mulufimako.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76b833582c---25981910015.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397d733c70---93921469297.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/15338686204.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1621a22e2---70770281557.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/17579684921.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/76042685763.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/90991915475.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d592b00b427---samisavapasemofokivux.pdfIn PDF document text
    • http://goref.ru/files/file/devanapubonozese.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/buzidusixi.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/95762297317.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210702180136-76900654457.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dce97eb35---golanefixaluwewugotobar.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7r5nlujmf00fsnthjribtm47r6/55485262285.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/wadudeduzisakefiwuzu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/vhg2t6l31tr3ehdi9chsj530d6/ninono.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/runulo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/25kn604jtd7ugav4bf7cdsqh44/53259951975.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/r25dqd8jdjmb6l2r3b1qlqumm3/76896868550.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_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 10816 bytes
SHA-256: 3181a115415f48eae618dafe98cb9b26d15760f728f917eefd195a9240a127eb
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 17384 bytes
SHA-256: 8673763c2e334871dfe51eef86628040f572d262015642494ed4bdbe60b3047a
font_02_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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