Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64dcddb502e0fa3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 11:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ecd1ced03d27b3bf0b9b4ae0a29e43c6 SHA-1: a9977d50c2960c3067095a09413dc2a7610508d6 SHA-256: e64dcddb502e0fa35b6f89e4d886bfaf7f16693f39d15bac0bf757cede00ec00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=onebox+hd+official PDF link annotation
    • http://phuongsen.com/img-chamthi/files/73261297897.pdfIn PDF document text
    • https://pecintajp.com/contents/files/61174510808.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/27d84bc496cdedc04831b34b04740621/risomove.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35bbce475---ragefajisutur.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/kofilakudagoreb.pdfIn PDF document text
    • https://dcimx.com/files/91516091605.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/fejuzepixi.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/mepotat.pdfIn PDF document text
    • https://kimcert.net/E/file/18087455140.pdfIn PDF document text
    • http://cpviettin.com/upload/files/58106018230.pdfIn PDF document text
    • http://17njl.com/userfiles/files/5882841045.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/dilexolasigoverovub.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/moviwunotewixadatemipude.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/rufibelirapopomuti.pdfIn PDF document text
    • http://mosjob.ru/images/file/dosekopidobadedenuxipuwav.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/mopulewasof.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/xilemado.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/6555890697.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/busezigari.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/84406771504.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f2bu5gjrpsvd6m4o4af0eb8hoj/xatadevuxawumud.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1g5hicj0nspln1dslra834sbcf/51500701831.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133613dac966---jakisopulo.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/mavena.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/97356587186.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/35281727761.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_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 10472 bytes
SHA-256: 937cd6edfac4bdf5fbd6f34e7eac177115bdb6726000a1e983d38a61c1d7b28c
font_02_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 18752 bytes
SHA-256: 67438e7be7ad3558a81d7f9df20e3ec9cc4228f9d4704b25da4738047b33009f

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