Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e17cb1e2e8f568…

MALICIOUS

PDF

82.9 KB Created: 2021-07-06 19:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e5faa00034257845cd7c732f3f66b30f SHA-1: e82be2d9ae311db001e32e40ead258c9c0f8dd2c SHA-256: 65e17cb1e2e8f568a585e8f71db0596de1cf1254a648cf13ee04638937732ee2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=endangered+animals+that+help+the+environment PDF link annotation
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/spk70bors61tj7ija851t3iu8o/rejefutafexurojonutufed.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/96229121145.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/teveniwilumevunigexodojox.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a876bb2e5b63e3f3a092502352930bbd/jaxogunomonagitu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/16037053288.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///97575646884.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/81052126103.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607003223110d---30027237227.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f81f28e77afde1a58e01623878c10ada/zezogawigodijuliroxax.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/7568057995.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/davewavumunevafewuw.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f446f9e6bf5a4d6a8d74dd8edc2d9de/tiwire.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/newarazegipobalutak.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/61f3c8f052fc4d87ad91625a1712e61e/6630017415.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4678a1e8ae33544bba282dc5778f332e/lofuwupopiz.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/45802828114.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef0b59161---69963134859.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/femasewizulidejaradaj.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/pagimizivureperen.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d70726724---55016602044.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928d0679509---ludasi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29516eeae---tadatudukezoveguv.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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10888 bytes
SHA-256: c955398802f15d9b63482f3111c47486702fe62ba0eba81c370e64deb4d679b2
font_01_sfnt_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 16528 bytes
SHA-256: 8998eb88891ee439fe961b80fa7412b5f15948d60e271dcb6e5a7c90cb9c8f85

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