Malicious PDF — malware analysis report

Static analysis result for SHA-256 d389b6e6af443cc5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-22 21:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 085dad37ffe4d41c92229df2c4550510 SHA-1: 7f1d24122822c0dfc2560eb3e5601543c1d705f1 SHA-256: d389b6e6af443cc56eade7483f313cfc0e5365986828ea99e038637b705250e1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised WordPress installations, suggesting an attempt to leverage legitimate but compromised infrastructure for malicious purposes. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=child%27s+play+2019+full+movie+online+free PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbe6a358a---pelisu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e457965523---pubawobezojiri.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa19da6baf77ac0f64677d371059e2ab/xasegarupukokovidotiwuda.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/73188690528.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/66884314518.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/49919990503.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf24423bf65e3db0993a96eed94f5eb0/51823515249.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/69254116005.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb938dc0e5---mefuzaxif.pdfIn PDF document text
    • https://anaksemut.com/contents/files/noxine.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/sixezazatoxilezetuxon.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/35174296311.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/65998584500.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147d2525d13b---40432533771.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/litogotozof.pdfIn PDF document text
    • http://czminghe.com/upload/files/bikalomasenanemafasubub.pdfIn PDF document text
    • http://expresskaliski.info/file/80948058040.pdfIn PDF document text
    • http://tochalco.com/uploads/files/21034872013.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/77417947175.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/38300837003.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138e332296d3---42372668158.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210910001340.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/18407838472.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/32455571481.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gebexudiworuduweb.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 17532 bytes
SHA-256: 68bf5d02e4b84b7e878a5ab2dad6d8356e029f1195aa6a81cd0e1e183ccf54a3
font_02_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 11472 bytes
SHA-256: 02ce69b3542891eb31b184b49499e441e04cab9f65ca9b8595392e5d00882ad5