Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf391edf8b2cf5d1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 17:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d89389a598a3c89d4db8a65092d6d432 SHA-1: 1dd47daf46636978da16bf7f2f735dcaa0a4b3e2 SHA-256: cf391edf8b2cf5d1f25631daa8d493bd593024f6892201e75e29fd903f26f39c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristic firings related to URL link farms and compromised CMS uploads. The presence of numerous external links, many pointing to potentially compromised or disposable domains, suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver secondary payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://calmoinc.com/upload/editor/file/gaduzotigixorore.pdf In PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/81051452600.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/57974538303.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/62764145852.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/posinizawavopufexito.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/58084077607.pdfIn PDF document text
    • http://caramelitos.sk/files/89763802719.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/poviroxilazonosetulazezi.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/65953930658.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/mobibawapunanarabiwegot.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/rafidunuwonilo.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/58614115022.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/00b216259bb570866e25a916faecd7d6/64744301683.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/16083032013.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f6c9ce32---39837516780.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/42072820991.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/3211432800.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/79541399094.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/dr3fo7abns0q1350014u58u0on/nadokogonaf.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f368c9026---87241427470.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/79925015507.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0337b17d---18096731824.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/7b5redcl2r68tbc0lh5n68nhpo/bukefiwez.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/90674608569.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34e4f85d51---71310999696.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/42202199707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=metaphors+we+live+by+lakoff+pdfPDF link annotation
    • 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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10984 bytes
SHA-256: 4c0c1e4a34ea4e5dd262c82e5aed153537e346bf076e38b525679e5d33ac481e
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 18204 bytes
SHA-256: c0534ad5fe793cf78a0fd38a0f49fa4ba2fed748676a00087679efd90fcee7b0
font_02_sfnt_off00013920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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