Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b64a6662b3fc15…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 02:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8082d93f6a8faa5a57fc656614b6edc7 SHA-1: a6c5787074d1314f024ece7df9dbc4a5366d960e SHA-256: 94b64a6662b3fc15dc69fc44be4d181de4f09cf97c5efe8e091cd5902b120fb7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=tesis+sobre+inteligencia+artificial+pdf PDF link annotation
    • http://shinies.ru/img/lib/file/11327902013.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dd38c220019d341311523b04393af28b/moletenipugopa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134f09123b3c---bojibefixirixazalumulova.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/43996108428.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab76b0a23---mupefofewevi.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3cc0de6f4b7b34851ef6e1abbac84297/14726121081.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/njfsgkufa6a38g8ur84r38gnu1/7154191465.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/igjdvnu4hh7q0lk4n81qircpp3/gebujegikeleniga.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/3625046602.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/sewoseleluriku.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/vabasukabevogarokigapujob.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/50032289010.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097b121579ef---pafibininepet.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120c75553781---17520223541.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/zimivonaxikigetemukaputox.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08ef6582d---filuwol.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/piwajevofodaxuzamafemiluf.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/vujoxad.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/72737567419.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/fofikegipivijuxupedisiju.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efcf3070c---lanoziwegun.pdfIn PDF document text
    • https://interconformity.ro/images/file/fagoni.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_off0000ce72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 10900 bytes
SHA-256: fec925c501256b7d7ff044e92164d82cdadea4de85655a7f29c4b0cf8d66f45e
font_01_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 18808 bytes
SHA-256: 21a1e02f01a18f4d993be118a1200a8715757fcfda41c0873ef4a6e2165b1edf

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