Malicious PDF — malware analysis report

Static analysis result for SHA-256 370feda6e3eb5cfe…

MALICIOUS

PDF

121.5 KB Created: 2021-07-07 18:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 298c36d0e93455863560a8a6e15f2827 SHA-1: 4bc863f056295e56b97e8432454fab1672227929 SHA-256: 370feda6e3eb5cfed1b8970f7c58da4798e2dc0a7edea0bb5817676488021aa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://popnmusic.fr/userfiles/file/somitoxoxadaruwowoxefijim.pdf In PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/58201846570.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098545c96134---97895349757.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ca1e1c7bbee---80237932000.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ovq8ba67cdvneaoq6t0ge7q697/baguzuvijegatixa.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/34072547987.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a74d8741d---gadovavabosan.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ethqpgebqdfvj2h7arc6saed7m/76723135315.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/898e8761b21a636fd95c29c7c9b02824/vilonovetijo.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/rilakojorunomobugevabilas.pdfIn PDF document text
    • http://askort.pl/Upload/file/lenusugel.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/fofutinevadiliduwenotow.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609407fbb9ed2---sumagu.pdfIn PDF document text
    • http://djpress.pl/Image/files/wapijusisoduxaxademejig.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa882a4bac---32797565125.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078e41902abb---1433132623.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uuhhbmd3safn6gpcl28mtrv2hk/xuwabijofofopelowika.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd37c1691---87477157193.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/popago.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/gegofabapogazexegapuzaw.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/xivasegowusagasetugesaso.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/rupeg.pdfIn PDF document text
    • https://ijp2.com/contents//files/jegopaxupavetunetagodexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=new+jersey+dl+formatPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B9 10628 bytes
SHA-256: f90df146891d9fdae6fa8df90ada0bc02977a24ab9768b4ab8909a56d5b09a53
font_01_sfnt_off00017c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C32 4824 bytes
SHA-256: 5f2617ef00d132f437f1c3832dd317b414f1a8b22d6d76ae6a35a25462a76440
font_02_sfnt_off00018d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D85 19236 bytes
SHA-256: a47d912a7c75347bcfc801ba2254c4c153aa02b41507b323c55ca15e2359c2c8
font_03_sfnt_off0001bea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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