Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d19f7c42771166…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 01:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d53e4156fbdf022184f9d1affc82dec6 SHA-1: 8e97c5a0eefd439ab12129a6c3c094695e6a8196 SHA-256: c6d19f7c427711667364a175ba079e4cf52aafdfbdbeff037448099f9496dd5a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely designed to redirect users to malicious sites for phishing or malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=chandra+payanna+mp3+download PDF link annotation
    • http://aktasmatbaacilik.com/resimlerfiles/95007563246.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911015530929373h5z98v.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/46060292220.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vbun4t1ssmlrtpqi5nt71k99al/fipaxugam.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/84533606911.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/95162363541.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/28401623160.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/piloferulodamekufomifax.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/dapitotizoxoxen.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4ujndsr6rhd6oqiphi6e4t3bb2/49127162655.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/39764736782.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/4752678686.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/surifived.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1ed013a4f35a9504dfe11676ddf08cc9/sujemisabuzojuvoledefe.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/91343695838.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/tafasovirexejefoluzalibub.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/42685151540.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/13268530742.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/tarulojiti.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/73288494622.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hfo61c6uqp2d402ef4va7h8s0d/72933958720.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/pozenigozofexiwutidu.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/xifegobig.pdfIn PDF document text
    • http://eternoohydro.com/d/files/sariwepigiw.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 10568 bytes
SHA-256: 876be74fea792b1181767d52069ddeb99f7cd72fb48bd73a8d8d2bb7ae1d1716
font_01_sfnt_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 20680 bytes
SHA-256: 4bc710a17a0feb6301b2129cf36daf03fb888ac95eeb1de4708ff353e2692673
font_02_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 16340 bytes
SHA-256: d42aa4f62c5d097899f4ca83752463671ed36338d1a9962ec0518aab4c0c7761
font_04_sfnt_off00013ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB0 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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