Malicious PDF — malware analysis report

Static analysis result for SHA-256 43409ba27da8e18c…

MALICIOUS

PDF

107.8 KB Created: 2021-06-29 00:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87038b940798f84ed837a7621e17e63b SHA-1: 01d4e382b3e4aa7a84b44a02c42abfe18b7cc3dc SHA-256: 43409ba27da8e18c47c7f1143fc19b83adf7e6aa2afeec105f5a3932226fa000
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://absigorta.come/file/11026723453.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/katumikonalunowolemad.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4aeb6bd615017ebdd7fbe80ebe352466/1774008121.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/zisutasexib.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/90050323070.pdf
    • https://promise-land.com/upload/file/83814871730.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qb6sfm6p5v57hkh70toa28anjd/19487805035.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7df417e1ff---24991047216.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa9cc0b95---90731944234.pdf
    • http://airconbank.com/upload/fckeditor/file/12338442645.pdf
    • http://diclenakliyat.com/userfiles/file/jogiremuwaxuro.pdf
    • https://people11people.com/uploads/File/ziwetebin.pdf
    • http://bafiti.com/sklep/userfiles/file/rifimivijuwo.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11737589d3---73964928458.pdf
    • http://digitalpolicycouncil.com/imagenes/file/12362192019.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ecb42ba8---lasakodiwo.pdf
    • https://cuacuonbentre.com/upload/files/54687272062.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607617d90f37a---vuzufezam.pdf
    • https://africanresearchcenter.com/userfiles/file/purigogem.pdf
    • http://swaminarayangm.org/userfiles/file/74997022801.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ae8db5e5---lowexatixekarogonomewuzu.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d41ce571---dusaduperutokozojo.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb8e833fe---45537018049.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0f1d3419---dowadafa.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609657f5af8be---44353487114.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=except+for+definition
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016c39.bin
dd77037089a805df980a668af644c3c09167635963b224bc3e00f3976936ac75
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16C39 20296 bytes
font_00_sfnt_off0000f1f6.bin
b617fa4f00f445f6ae44ece924e098c52a7b6dd8563e0ece05b56200f9e6d45c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 10324 bytes
font_01_sfnt_off00010951.bin
b25fb01a909788c41c64b839aa7e1578ba29bec5425853901c2821200c18a303
pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 31808 bytes
font_02_sfnt_off00015428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15428 16792 bytes
font_04_sfnt_off00018f9f.bin
7e138494c80d88ad703db911f966044ef30a7b587cb1f99d650f7b46d56ed86a
pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9F 4128 bytes