Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1d481b903c2447…

MALICIOUS

PDF

84.4 KB Created: 2021-07-01 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 828276b228a043232afc7b2248a27a25 SHA-1: 153be03513c4b4833f80665e12df875d7483f86d SHA-256: ba1d481b903c2447a5d1eb03b8b2ac5847bbf7b1027884d5a4dba3879e867c65
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=how+long+does+it+take+to+make+beer+ark
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4862ecc4---jikomofofagabutum.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/941cecf038472af2c5e43e01795baf99/wolibu.pdf
    • http://congtyvima.com/images/Download/voledirimunujujuxoserukeb.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd838531d---dijupugibapol.pdf
    • https://dpt-mh.com/uploads/news/files/78277787374.pdf
    • http://kotolantopeni.cz/file/zumoluvepegugelezojapemos.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b952aee8ab1---93181610385.pdf
    • http://unesco-mediain.cz/fckfiles/file/mukekebasofe.pdf
    • http://cesishotel.lv/res/wysiwyg/file/gimigezul.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c79883e6---fuxokawumudizu.pdf
    • https://aonetreks.com/uploads/file/samarepofotomesijizibod.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607f559f99352---widobopoxubejamis.pdf
    • https://umartravel.com/files/23170613097.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f109539111---modapisuvoj.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f742fefd07---41146226833.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/96e3edd3ecf56c1592bc9ae0bfac7e04/xosaxokogedepi.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094504f3431e---riguworipopilepawisivavo.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210604_4B437135277E0E33.pdf
    • https://ikima.fr/uploads/file/pevibagaritozetaludidimo.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/b6925c60f48d642a62f28368beb67372/54727363493.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2612670c7---79775160677.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/jojojufewuni.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_off0000e70b.bin
3d1593bdf751e2e6eb9de23096ad3e8704a88d5e763cde29584d7110900b10d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 17052 bytes
font_01_sfnt_off00011352.bin
a7f6185249722b2879f56688bafc0467584bb58157da0827d57b70703595c4bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 10900 bytes
font_02_sfnt_off00012c57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 16792 bytes