Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd0282b49e6da35…

MALICIOUS

PDF

69.0 KB Created: 2021-09-08 22:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b1c26c7923e945f90c276c3355e7bc3 SHA-1: 4b6866b64ddc066362a6aa9e57d6a936575d132e SHA-256: acd0282b49e6da35b72f3cc299a112d499bacaec717b8f2084a33da507d92b1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites hosting other PDF files. This structure is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=what+is+other+in+android+storage PDF link annotation
    • https://fentesmakina.com/paket/upload/files/razokefonimi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b6a7c164ee24f14ffad7d9555166e362/79683835803.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/36e4bbc3a4c33675391865d72b357890/nariro.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/66093519188.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161357a3f3e4a4---xezoxevapibirafun.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e093038faf58be9fea1c0616cee1bd07/7103310919.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/xatubibubirojefa.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/38441362399.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/xudelegokufipozopataxowe.pdfIn PDF document text
    • http://freestyler.cz/img/file/jegawovimitaxuk.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/bogekufaturekanur.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/15829235685.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/tutogog.pdfIn PDF document text
    • https://citytrafik.nu/images/file/79511758686.pdfIn PDF document text
    • https://funbugs.ie/files/file/pimikoxetefu.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/zasuv.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/21824788165.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161368e9684d76---18716782869.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/32240922590.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/jexipiki.pdfIn PDF document text
    • http://asid.rw/userfiles/file/69756368329.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/gubuwekiminefizedi.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_off0000b198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 14968 bytes
SHA-256: 808b6a52553371c31536343854dd4b0c9a90eed4da5317a3dc310471ce8bb5d9
font_01_sfnt_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 10476 bytes
SHA-256: 222b8742737c0158ec03f45c52562c65b1f752bdb3ff53f5e3e98b80baa7a6b7
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1