Malicious PDF — malware analysis report

Static analysis result for SHA-256 de049504ee347924…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 20:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1ac1e196b5e98652e896a435c39e830 SHA-1: 7b5c903ab4d00c33b0ecc292c2583a7cca53899b SHA-256: de049504ee347924cb0e17d8210b7278703374b770b4a1a0cda7927e2917aa17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of external URI references and the overall structure indicate an attempt to manipulate search engine results or lure victims to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8243

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://inwebjor.ru/uplcv?utm_term=free+spanish+worksheets+ser+and+estar PDF link annotation
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070b54f9e283---gasija.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23544b038a---tuvamapesogotuko.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/sotukibafezukulasa.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/28b3fdc6b0bc15b382cf66fd19191cc8/94025250160.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/dorebamikevulejura.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/50761951255.pdfIn PDF document text
    • http://xenangheli.vn/public/files/52543682915.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8bf73187f30d41af4125e3dd8f89e3a3/bifibuwijopugemoxof.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/peberu.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7269_20210525181238.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/nunuvigufunojokavanaban.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d5cb026c8d5a5fdef4e5ca933795d9bc/xeputuwuzasorodem.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca7f1a26---55843066842.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/gunimebogurezesikuvag.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/wuwitofagipopava.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/5565373716.pdfIn PDF document text
    • http://rubensova16.cz/files/file/84897258267.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a20ou5eh9sg395pmrlk40nsh55/64454069878.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bfd55ed86f9c5e54e95657b9ef07d5df/folodafomeveseka.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/3glo5e9ka727ntt3ungi5rc48t/zolepu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/35238755970.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1fc9e9b9bc4e72492e555fcd1cc4d17a/82698056194.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/35296665599.pdfIn 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_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 10600 bytes
SHA-256: db348ae7d32782723ead3a19e593ae7d51b12a99a60ae86e932b772b02405c49
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 19128 bytes
SHA-256: 3ab0b9b3d62a91781fe08cdf4683f5898847ddb5b6cdbb53b45845827d105ca6
font_02_sfnt_off00011fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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