Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bb1c20275938ec…

MALICIOUS

PDF

107.0 KB Created: 2021-07-28 10:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 446d1da5737e72ffbbd03a0eb17e1e7e SHA-1: d69678f0f12fafe30974f8b8aba1a946cd65a5fe SHA-256: 55bb1c20275938ec7cb8b8192be2613c1dba09f214c9fa627385d59dc907f560
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. No scripts were extracted, but the structure and URLs point towards directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5cd998b2eb9467b706b1f00c0b131d4/36372959621.pdf
    • http://farashimirooz.com/files/ninadolepidudatovo.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/jareja.pdf
    • http://denki-shonan.com/uploadsfile/18911858041.pdf
    • https://pmsp-me.com/userfiles/files/sinesujovetasusabuf.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7d195cb2---japipomido.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1b204a63---zevigofaraw.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61bc60959d---gebowomijamonafodal.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0797efd87---repitamomujapivofegex.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/j8vd5prbg3bgl1i1vn1mejb25q/88963758312.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/dadum.pdf
    • https://kstraders.com/userfiles/file/94551478173.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/58170725512.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1mn6or6au3rb9uoc1iau2qmt43/zutalo.pdf
    • https://vivekanandbawwa.com/userfiles/file/24191352640.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/22b0a308fd1289a4ade7a867f5352c11/lufexeziz.pdf
    • https://brahmagnanam.org/fck_uploads/file/8244427685.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/434e7373a51b57dcf7dd6fa1986aceac/xafesoxudiridivan.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3ab5d1af---totumovanojukolure.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fec0e63b2d1---wimazur.pdf
    • http://x-site.by/upload/editor/files/61853316172.pdf
    • https://dodatnojamstvo.com/userfiles/file/56712548141.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f30b04c1d932797c19fc3506551226b8/84183576953.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+does+macbeth+do+in+act+3+scene+4
    • 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_off00014091.bin
b562a4436dbca88603f2160a0ab63c08db944d1e5c7f36f6f6d6b0f8527eab79
pdf-font-stream PDF embedded font (sfnt) at offset 0x14091 10872 bytes
font_01_sfnt_off00015997.bin
46c4c40e50202f3d37866786d88854be822f0ca9764b0ee286248361491a0524
pdf-font-stream PDF embedded font (sfnt) at offset 0x15997 16976 bytes
font_02_sfnt_off000185e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x185E0 16792 bytes