Malicious PDF — malware analysis report

Static analysis result for SHA-256 841edff04f44fb65…

MALICIOUS

PDF

112.5 KB Created: 2021-06-28 17:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aded39414fd0e80a5f35a1a9f4d4d89a SHA-1: 09fe809bfd7bd279e110a35b66f2fd372e97048a SHA-256: 841edff04f44fb65764b4ca25cc5dba9ed1005ae0b9222b618403d363931fd26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malware or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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=in+the+bible+cain+and+abel PDF link annotation
    • http://yngc.ru/admin/ckfinder/userfiles/files/73279913697.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dntb3napvdsjp60jdgaoe6pmq3/bewozowoziwunamem.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/12768002495.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/74e56a02810b51c98971b714749dd133/47655703599.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55dbdbdc3---43624159398.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/43032567415.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1e016c94---244957810.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a387026f389---5172868672.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0mcbm8lnmjq3sqnali7dfglq16/novebexujubujesuni.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160926cb604e35---zasedumaroropeka.pdfIn PDF document text
    • https://reniuved.it/file/zerarisud.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/nv11mtc7nnb4bvg44b77pnonf6/woxulogiwok.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ad7juralpo4t9pcshnn45ii5b3/jumogudujelepafajela.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/xakixivazojazodozu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/98368925891.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/vabikowariwetesuvaf.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hgd2omg22s12ot4t796dg7pl7b/moliwomusugajuwawat.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d389dc58bf---77782644903.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/bidazefonur.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff2e18681---54479567360.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b114682169bb1d66f626e9571efbf871/75006883363.pdfIn PDF document text
    • http://zuche0551.com/upload/file/70322446876.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000148ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148FF 18476 bytes
SHA-256: a1d596c8b47d6302bb290ba259e137e03e39ae9dd4b8d38b46b1f4fd77294ef0
font_00_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E1 21092 bytes
SHA-256: 84be3d6dd7d82d5a0b4165a8afa50d3b18d9c3434a263ff6a7d387de59bb72e9
font_03_sfnt_off00019c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C4B 10168 bytes
SHA-256: 313bdc53be6421e139fc71a21d41b1b69ff93a5cb708bc29c20d7436cc44c8df

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