Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abf0b79c370ac27…

MALICIOUS

PDF

84.7 KB Created: 2021-06-25 19:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0496a4b3c33d9e53b21a8a1b5a47b506 SHA-1: ad7612c15722a899a60fc6dd6baa51ddd7449b85 SHA-256: 6abf0b79c370ac274abebeae5951acc617b19d8d931855b4607fc32011b6c335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of multiple distinct hosts and a link farm structure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0618cedb---38696469952.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7869c9c57cc1e18ca27abb1876eeb109/79064160520.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/unnpgmc1bki5kpeue99ob1tk81/tewamegu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/77586535551.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608001e53e44c---29716577138.pdfIn PDF document text
    • https://telenovella-bg.com/files/xijamuzevizibudasa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c6f011ba---buvopusov.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/obnf0n5fku4nimg3eklnm8ha5r/83108375961.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8f67f26dfaee3c2382e64e4222f1d388/20047967844.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607196c376230---59554560101.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f8800ae31bb53c9768f5780930be37e8/12013700900.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/degiluse.pdfIn PDF document text
    • http://peak-experience-japan.com/55555721979.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/35306642041.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/97414633600.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1fc641cf1be0efa0ae25eafac3b1ec35/rolekazenerajibetowij.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/25033064142.pdfIn PDF document text
    • http://canadanur.com/resimler/files/dadatejogozigapibugeruvid.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1293a8d5---bobofejipezodedul.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/mozixupejo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/hk8r6v876q5b4h7iad1vooofar/xitesaluzafafulenazogexa.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/jifabironevudefigafebo.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/pagatob.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/58389241093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=marine+ecology+processes+systems+and+impacts+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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 11068 bytes
SHA-256: 6636bed793bf88b1bc4ad3677880e2dca47e0cccd96a915d8b173b0c4d830741
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 18672 bytes
SHA-256: e28db2e47a514c76c5b0fec35d5e7eb76d348682cca26c038473e256036a8c90