Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8e8b6f04bee753…

MALICIOUS

PDF

90.2 KB Created: 2021-08-13 20:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e066073846974a5d062c05a6d1e93854 SHA-1: ee5a28690db32e8ef2f44584c235076942f99a2b SHA-256: 9d8e8b6f04bee753a2e97d9a707bf4aae03089de5ec799baf6e2fed7cd75599d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=watch+the+hunger+games+mockingjay+part+1+full+movie+online+free PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098333a2351d---58855518850.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/646ed9c89234a64e4a43a37f82f99282/nuniwon.pdfIn PDF document text
    • http://debden.org/userfiles/file/wopumozimigikipidutitovas.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kgjti71iu8ah2n5c15n00jue63/90136019153.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96d5271ab---sikijepe.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pibijisodidoz.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e61e52b1b34---77239348940.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/47971285766.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/eeg6t0vh7p6aqldtrl0opuf6dj/6794367312.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/40632696887.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/h3vk2tsr5gpiv1bhv6uijb6b3i/tuwelimebazabobedujag.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6f9e9abab8f5c6ac8c5051250fd4cb0e/fukugex.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qcdn1569iposh723d9a5qkftai/risojotukemoputokoparolur.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/busigupukiduzidu.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/kumetozewinenegazemaliva.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/wulegewufomizuwarun.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d1f40334762924d69de27347532e70e2/mujenesovolodedamovab.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/21578731451.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609091c4d2fc0---nebipaveboxojibet.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/35805647361.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_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 17356 bytes
SHA-256: 021c36a7c5cc75e26934368fe5f305c2ccd39f5e724e7e44aad94b7ccc607de8
font_01_sfnt_off00012507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1E 11476 bytes
SHA-256: e921f1eb70437fbc4886f6da2664d26e7bfc7bc38c36e474741092684a24ec9b

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