Malicious PDF — malware analysis report

Static analysis result for SHA-256 717d518faee9b49d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 19:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1dbb198fb263f42cccc4324106d1ddab SHA-1: e311ed7a298e989d3fe33fe73186427257705022 SHA-256: 717d518faee9b49d906bdd22a85a3595abc59d17a252134f4fb68c5e9f16de41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://grafichesirio.com/userfiles/files/dumosuzesuwajipej.pdf In PDF document text
    • http://petra-dario.info/upload/datoteke/45821127354.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca76eba5f---43323943831.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/6677691756.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/00fd58f7a23049baa0baa8c80bf84abc/mubej.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad3e8ab2cd---7245596930.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee32e2a5ca---nuxesomitedupurakorosola.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/susokugimojuzexowejegoto.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/79442557025.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/260620524533.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/lesitogunodilikugogoreg.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/59534164160.pdfIn PDF document text
    • https://brod-plovdiv.com/images/68417181012.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42424e483b---jefemibukemogubif.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/banutosowovenel.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de20ea26fe6---37570817240.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/c0808m6j9v2qfmlrp9obh6c6ob/23077282536.pdfIn PDF document text
    • http://idroter.org/userfiles/files/98977048310.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/nikubipikuket.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/62252131616.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/37584242729.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/74726080888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=direct+and+indirect+object+pronouns+in+spanish+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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 19544 bytes
SHA-256: 33622028139ce6647df9972c3c3ddc5ecb2a21af6aaf1d46bc8d8d0a5c2de802
font_01_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 11040 bytes
SHA-256: 502128d9331db666fa27bb4590640fbd306e2846b8e6baf09b5eedc6815e9f83
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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