Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f7da19b9ef25f8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 09:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17634e064bf2f6f9235a7f1b49865bf7 SHA-1: 1e47ef16f9f4664223352bf2945ee2aaa0c80116 SHA-256: e7f7da19b9ef25f82c6337aa40832acc27176267626ed3b0e7ce7abf8929d6d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://we2meeting.com/ckfinder/userfiles/publics/files/12949297044.pdf In PDF document text
    • http://freeski.hu/freeski/file/25555569806.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/73347890901.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d23b2d79de105db91f19df59991233a0/26238027706.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/wenanavetexuzebux.pdfIn PDF document text
    • http://cpils.com/userfiles/file/84047799812.pdfIn PDF document text
    • https://2acontractor.it/images/file/56747976904.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13855311218.pdfIn PDF document text
    • https://red-adlay.com/upload/files/fosezaj.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9ccf0b1d---94083517453.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/31640bd47da13fbd13097dd204b63637/fovifuba.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/21706790755.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/08f55e4644e24cf19fe48ddedd6ff3b7/tuverowukozenafibebelosif.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/30400334775.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5a892839---tipox.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d9bbbf4f1c1f4a56190c2ef46992d4b1/jofatitu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992030cd9ea---59739942336.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/kidenekodigorinitaragos.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/65799529391.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/giwusaxobetu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/dtb0flap0l3dnd5190qhornb30/sekejemikawejutobari.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210901070137.pdfIn PDF document text
    • http://josquin-capella.de/download/68159492414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=treatment+for+npdPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10316 bytes
SHA-256: 34c3328a72185539585c6d996454111549b31d8b11b31b5f69917cb423d29025
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 19604 bytes
SHA-256: 2480acc5611f12b1323da844b7ce998808cfd8b5c7194ed719fecf9cc28ff955
font_02_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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