Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca140d126f71d27c…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 18:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 028fd3a7f5feb6da499507a3f6e459e6 SHA-1: ee1933f26b918195ca9ff088bb4db7108c2e2791 SHA-256: ca140d126f71d27c4456dcb6fb755001e1a24dfeccb2d54885cb2f6837709082
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, aligning with the characteristics of a spearphishing attachment. No scripts were extracted, but the structure suggests a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=rip+and+tear+meaning
    • http://naturalmis.com/userfiles/file/73187739646.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/o3dvimp5bmecjelbdj6othuo9r/14996370167.pdf
    • http://computer-rudolstadt.de/upload/file/savegakobajokebizas.pdf
    • http://coffee33.ru/archive/file/58467473267.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fc4d1f0b---57820920658.pdf
    • http://extracam.es/app/webroot/arxius/file/roxodum.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/mg75m2rd6dmkgjgglbd4k3jrgh/kozew.pdf
    • https://artenika.pl/fck/file/lasafupadu.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b8711d07b521ac1e0807f652d1bed0bf/pivivekamawimozagob.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/pivunoji.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88bd3fadf---43931115788.pdf
    • https://kopari.hu/files/file/18023110253.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6pmttvnl74qbgntt756q9aq28l/rajuvesolupigom.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepavodikiwafekedezo.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e573737---rowowonawuxozuwa.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/49618501d74374c70e9449e456b28d09/62258289032.pdf
    • http://guides2alpes.fr/uploads/file/misowanidopu.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0ce925c4---54811164172.pdf
    • http://skyline1968.com/clients/74864/File/97876928558.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2b59595ab33bb6ab84e73fcaae935f97/25620572571.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160add792986eb---64220937605.pdf
    • http://mikomisushiwc.com/uploads/files/mojujulosekawirorem.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_off0000f696.bin
29ed1539d85b63f09bdd863104407adebdbc02c7246d7f13b028c32924bd9780
pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10444 bytes
font_01_sfnt_off00010df7.bin
508cc7787e780776e1b6a8750375144dde1129113ec9c180b03b7162099568b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 22004 bytes
font_02_sfnt_off0001449c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 16792 bytes