Malicious PDF — malware analysis report

Static analysis result for SHA-256 8152cb78e4220fdd…

MALICIOUS

PDF

85.0 KB Created: 2021-08-15 10:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1662f9317fe0100d5bbd0c2a206b8ea6 SHA-1: 10f2d48bbc56e64f302a179553ebff06b5ec2064 SHA-256: 8152cb78e4220fdd093d6553cea32c156b31aa9da0ac1af9328661094b378bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm suggests an attempt to leverage SEO or distribute malicious content across multiple, potentially short-lived, hosting locations.

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://arzhosting.com/calisma2/files/uploads/rudiwigo.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/135292dfed993aa6fe254b8485f423a0/26589274001.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d0d769f9---91012369401.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/82741462584.pdfIn PDF document text
    • http://novichiha.ru/pic/file/88752215768.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/92209230633.pdfIn PDF document text
    • http://besteva.com/upload/files/57096798607.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/e6bo81h3ddlc9tjjhlh2vrpq9g/zikaxomopozolevej.pdfIn PDF document text
    • https://cristalensi.com/public/File/lalovufizafam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb266d348d---47368411767.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/63452559404.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a02cb559ee---28259062372.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/tusepewenulivuxopafunuko.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/xafisisalaxakiwexadakoda.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/69a2d98548cd456ad26bb7f4f1cf3d18/vojiraxefututesun.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0648858e6---rolusaxaniwavuvogugekabuj.pdfIn PDF document text
    • http://uci.ir/userfiles/file/95705301589.pdfIn PDF document text
    • http://tayles.com/uploaded/verolulegejovulexaxow.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/birosatedoro.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/84145001869.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced56bfaa5---49484540217.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/26126565914.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/79057878898.pdfIn PDF document text
    • https://megashina24.ru/files/files/71549251248.pdfIn PDF document text
    • https://soechi.com/userfiles/file/pawifitimuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+save+photoshop+as+pdf+on+macPDF 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_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 17576 bytes
SHA-256: 61113d0c3dbe7cdb0c9a3f31c075ac4a540fb48f3f004ffb1ac446cf7519f94c
font_01_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 10788 bytes
SHA-256: 82902303c1d4242cf3616f0db50d343219d457fd16ae35dcd6744203adb75df9

Open this report in the interactive analyzer, or submit your own file for analysis.