Malicious PDF — malware analysis report

Static analysis result for SHA-256 2577087edaec63c7…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 03:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be3901bb6b0296631dd8bef85c2ad184 SHA-1: 465249da03ab28dae37ada82e3395e62c2c108e8 SHA-256: 2577087edaec63c78d4b2f3264133e44254b13b58f5fe3d8931ac8519652a09d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/v3g413eo1hrempdl8og4cquh2h/sakimotix.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/580089cb9bd178e13079aa1f83804b9e/59682485562.pdf
    • http://www.celso.org/download/wofoxosobetalo.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/bdf7f34506fa3f1cd1f5f1c5834d4ccb/mobevoxokazebasev.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/84ea148d31f237c842d764057cec2dc7/23837685096.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7280c8e6d77872bdbce9e669769216d1/rukos.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/8q2g8kd8sq2733cvn9kqqvk0u3/kebibupofifoloz.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99ac38254---tipafarirafug.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8809894283---xinabuzemeved.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef874446f---48838323517.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/ef1a02c14556ddbec5b182e337d862b0/gorades.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096671565d06---manizinodiwamefuwut.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac96c09677c---24259919137.pdf
    • http://oicenglish.com/imagexx/files/zuxemi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d508f2b32---61320677898.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31567a83a1---97420028405.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df75594d65---tugatujajetukebinusat.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/e206f22910976115ccd94258bcdb1476/wajuworunafabazorerej.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0e461f7550b7e41c9865cf71cc75365d/14687746389.pdf
    • http://kfbi.ru/content/file/91482722122.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/moxutakadukuzoti.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mant96gjkqfuf90jljf0qbosn6/kuzezunagoboke.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258bfe693c---loroburomokapukujafoxujir.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d20b37bcde354c2735ec23eb5106c03/69995965861.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=can+you+remove+a+signature+from+a+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e1.bin
378533ec12602e10c25b8a604976c7c3ad9297e962f443f243861c73285e5305
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 11104 bytes
font_01_sfnt_off00010bac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 16792 bytes
font_02_sfnt_off000123be.bin
5835f06ae61dd310dc029741aee3aa48582f81639983ba255ff7a0b54b79ea94
pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 17164 bytes