Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5c07f79026a0ef…

MALICIOUS

PDF

82.9 KB Created: 2021-08-31 15:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a62656ace7e67d228fa71180ef3aabe9 SHA-1: 4fa9416e143946e77a70457cdf6ee381c5abe530 SHA-256: 7d5c07f79026a0ef8542c290eb1f22d4e2128394fee9e13ad2d36486017a08bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=cut+the+rope+game+online PDF link annotation
    • http://jrpst.pl/userfiles/file/febebenuvesodifafexi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b575ab20---88677824398.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/38431466676.pdfIn PDF document text
    • http://chieucoingason.vn/files/70199420650.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c474d704fb446493c4ad0395733f55c5/sezibebiwugum.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/67461724012.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/o9npvii0fugj4kg9qqkl2j60ko/tosumosogatuvipug.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/88397653357.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9055eca2---70654165709.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/33612738931.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/76eb1c585c384792c58d92f0962acda7/sutiruriduvawazuloros.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/94723319613.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/xuzodinegimas.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7f89bea8---zemufokaju.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/9869887083.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/dogomulumufuzunoxul.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea6a65be5---96438604702.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/tirufurotulowefew.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/sezejelelazetenudek.pdfIn PDF document text
    • https://olterus.com/contents//files/sejururimemefetu.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/sivusijilulosiwabowadowid.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/22044377802.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 17924 bytes
SHA-256: b679129c9babb0646badcb54c4de27ce27e12b7f014a88fbab459b33bf72d8b4
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 10664 bytes
SHA-256: e244f06821dc410fed22589cd11d1676037b18e23d6494937cebe3f1350ed081
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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