Malicious PDF — malware analysis report

Static analysis result for SHA-256 336379b584122eec…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 20:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c406757263ed1188b055ff077cd94afc SHA-1: 4c04b234c192c6ada673b5daddd4c5d752c0ebda SHA-256: 336379b584122eece8878fd6c26307b1e630cda7e8af20703ccb75b1e915ef98
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to exploit user trust by appearing as a legitimate PDF while leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cvconstructionsgoa.com/pharma/admin/userfiles/file/sisojubasaxatozevimavon.pdf In PDF document text
    • http://ebd.su/UFD/7623/files/wibodisinidefo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed41b29882---91937931829.pdfPDF link annotation
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/73565c543e209cc4bc83ffb4366a2186/vozusow.pdfIn PDF document text
    • https://everestart.com/images/stories/file/39709524155.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/9575197643.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9034d4bbe84266af757a34381275f1cb/xizusabup.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/sidifofe.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f028894d5be---negozitopulobuleroz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087105e3aeee---81894183488.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609842b9d636a---85420096030.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6e73257a719919672a057a9dbd3a20d8/zazupufisikunexinelerinar.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/voduzibalakubamoje.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b2cb454a---87701614000.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/33174609727.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/88821628164.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/52480284363.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b10a0d9a4---76177808764.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/sesedozeloletu.pdfIn PDF document text
    • https://bnovum.hu/downloads/53685380174.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aef210456---vatozatot.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3786dc7b25---wolukagadasisoxanat.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/momumikanafusutedilimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+clasps+in+rpd+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_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 10592 bytes
SHA-256: c0ce681400f376da38ef5f3c100dd562ebf4baf00a6d2317aaf1451481c9c3e9
font_02_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 18144 bytes
SHA-256: ac69c5dd20e5c73a79ee685bad445e865d810aef926905d6c3eb8d40b0ae7d56

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