Malicious PDF — malware analysis report

Static analysis result for SHA-256 c187a29e54ed8e87…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 20:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe770cc8307027d528f3a962f77739d4 SHA-1: 28ade539817f8216f3e33965eafe46e8889c15ae SHA-256: c187a29e54ed8e878be5bd68b1de41782c6cc8764eae3291842bcdc41a177c55
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=l+know+whom+i+have+believed
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5b9ea6ef---28243181934.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b06e1c4db8e4c8a86b01fcabf8621022/sotake.pdf
    • http://dawahcity.com/userfiles/file/27353864950.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/tobelepofekivadatimerutuw.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/tipara.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac91e923ce---99552569824.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/6360025905.pdf
    • https://confetti-seasons.ru/upload/files/98800562932.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6d06cc578---gekoxiwulisovadebali.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5a29e21e---tijudoforadorajujore.pdf
    • http://on-video.com/movies/movie_data/file/xejumibimubiwefonuzaloz.pdf
    • http://yuemeism.com/uploadfiles/files/43565781794.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hp28evi1g1jgsvnhr8pr4bf7m2/jelupin.pdf
    • https://angkoronetour.com/userfiles/file/xupazetufurimet.pdf
    • http://zabradli-znerezu.cz/userfiles/file/lawovifara.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160846ac34ff33---befukerolalatiparetom.pdf
    • http://rollfactorytogo.com/uploads/files/fixaninunemajimem.pdf
    • http://www.aluvascientific.com/UserFiles/file/nutuperaretix.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d786789f57---24822362063.pdf
    • http://studiomuraca.eu/userfiles/files/naxeroxamejixop.pdf
    • http://dade666.com/userfiles/202106file/2021062020205270554.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/bcf9784e95500b00217895686dc3d7e5/37023158968.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f8.bin
5c8f4e1a1d74e79c17c73b0dc122dd3cfe4e432a45128f8c2c9120315700884b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 16968 bytes
font_01_sfnt_off00012200.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 16792 bytes
font_02_sfnt_off00013a17.bin
8fdc16b3889db6484e66ee60fc94b37f0a0a497c7ee2d8edcbef2ea620fe4b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A17 10488 bytes