Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1685338d743750…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 09:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a826b928851a83133372df23a5f534e SHA-1: 2a66c0f6a841705ec845f4bdaab51d1c6524e9d0 SHA-256: 3b1685338d74375036d6ab24162f63256a595ea82cd83530db5a4c3f11b8fd1f
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lead users to download further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=procreate+android+free PDF link annotation
    • http://arcenevents.nl/site/upload/files/84341905385.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/91269181244.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/18439529786.pdfIn PDF document text
    • http://ruihuitax.com/files/file/46864115766.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/639479ce2d2e92b7a999d1241a61b6f4/95971700967.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bae7856a649---livodaxezuw.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/64873124398.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b66e2b66b7---gaxekukakebefirawu.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/funinifasaxox.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/mekejuzoduzesilole.pdfIn PDF document text
    • https://digireg.nu/upload/gijifugene.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0e49ae2ac6efaef79057520bab3efb64/14845969050.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/27627414628.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/sigixitemokalosujogug.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4329801e---55078613566.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/domij.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/11425284319.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/39850764953.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/84350343534.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b673e98c305---bimajititolitigaviteli.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/nijeguzep.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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 18148 bytes
SHA-256: f8bb2511f93cf1b63d609289e7d9658a02667a32bcd95dcbf99385d38200bf11
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 10256 bytes
SHA-256: 9f152a3664d03447fd409774799c0bde3d52219a7cc8712939cd0b0ec0c012ec
font_02_sfnt_off0001282f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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