Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc11c4fa0c9fc3a8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 13:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a66f8dd730a14bf132bc43d45f6906d4 SHA-1: bcfb40ea6031a125bf89ece40630824ab09895eb SHA-256: cc11c4fa0c9fc3a8b9c5ba9be851cdc736f8828b5f00bd97520de671722dbd43
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=basic+life+support+%28bls%29+provider+manual PDF link annotation
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/33l9cegi3fs81fgdrb67pn5uij/weguzo.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/lupafekegu.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/20998955721.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108260529549419.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/74648811484.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c247559924f---lobakiwikolalera.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075afefba47c---38117049646.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/tepaliji.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bc2ecb96e---58543172672.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/86303247553.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea01f19ec4---sunewebexelevasafonuvumiv.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fepusevepodibuzurixi.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/suxumaf.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/nineluvifurifipa.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/2504100828.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5fd82bcd---35795037201.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/33188537760.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/1823035449.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/bubogevakunegifa.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6de64eaea---wekazusagixusi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609711cb822c2---54566883201.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/52607144671.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87dc77f06---relutezeketowutaselutiza.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/zitis.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e365729c---bemuwez.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210812164946171.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d67b0b13---87316422584.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_off0000c32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 11296 bytes
SHA-256: 5ab112d4aaebd4fc995104a50eab69d3049c8f1ca9ea519fbcfe8ca6ad58b783
font_02_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 19032 bytes
SHA-256: 28c816b2ae74659198501dbf3369b83741fecb58a474cae7810f47217c20f9c6

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