Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca8faf5bac592c9…

MALICIOUS

PDF

163.6 KB Created: 2021-06-29 07:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5bc51970fa8111a563f8e426709cfee0 SHA-1: 6def4c4428b0ab1079b82e3ef935dc9775bb13ff SHA-256: 2ca8faf5bac592c92273f5b11b8a2143c142a74620c8a45837a897da8353309c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious content, likely phishing or a trojan delivery mechanism. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://okfilm.kr/userData/board/file/tuxewodinibewem.pdf In PDF document text
    • https://people11people.gr/uploads/File/64937320161.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0768si4v5ht02s0l5rvdrlfs5a/rasumamamiwemibujilopena.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/64bc89977232025b2459769a27cd922f/57994330673.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fcde39d03c---65065105578.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/db90d17bb369088866be02c21f8855ef/87537137508.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaabca46244---17485396025.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090eab897549---jarak.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe65075b05---73766816801.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/ledabukizaderinon.pdfIn PDF document text
    • https://rajaunited.com/contents//files/xaginaraga.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/294ba4b57783cfa15e2f5b054d94718d/99182734369.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7c001e40---xijoximefivogaladujem.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ce9d35c1---fuzarojukawikisexe.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9b125f33e4487a260e9ed71fe9e688c1/xajeruno.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16072a48a2283b---14577256101.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/rizubuvularijikikavibi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa36e0f284---81959954717.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/46503589168.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a7fba5d1eed973ea660025ebdfecc1e1/lotov.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6f42a6700---puxapiboluman.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d041196b651---21522233189.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b60a6402---83295825468.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/86437761029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=moses+and+jethro+in+the+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF5A 19560 bytes
SHA-256: 7498ba60761f0e79a1deccfcc401cf247a65230b439c4cacd0b5ccb0cb6c8fb4
font_01_sfnt_off00023045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23045 10608 bytes
SHA-256: 81aca736bad181070a76ec3f1cbebe792ffc9f1323945f85538dde73d5ade1d0
font_02_sfnt_off0002485d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2485D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002606e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2606E 18980 bytes
SHA-256: 33d03abf0e319dbfaa7406fda00b9577f1a37898eee94f97d09b63bbb36861fd

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