Malicious PDF — malware analysis report

Static analysis result for SHA-256 5787289cc96df0b1…

MALICIOUS

PDF

76.3 KB Created: 2021-07-05 03:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e769bd2e0c79f2f75a919de0fdba91ab SHA-1: 7403e88731b74f508272520ddee28d10bd94b971 SHA-256: 5787289cc96df0b1233550c714751c73d55fc40b3d23190e18847e0fb8e10387
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised websites or disposable hosting, a common tactic for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=palmer+and+perkins+international+relations PDF link annotation
    • http://doreenindiatours.com/userfiles/file/sokuvuwavav.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/84486948675.pdfIn PDF document text
    • https://artbynela.com/uploads/file/70407165565.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/98hu833inhcadjta1j9horo7g1/pabefurebimomuwijakugo.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/170b1b8d20987e4b715c2f4cef08a641/poriwokivinikosogi.pdfIn PDF document text
    • http://tano-cable.com/d/files/95023688783.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2a8f22af---19325250834.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3ac5ca9bf71d6cbea6d8eae1825a5f2b/vukonu.pdfIn PDF document text
    • https://kawanmto.com/contents//files/zixivopopaf.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/lanat.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ca938b8d---87456197145.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1793b5dda2e4a0107bd1e9adf9250e80/natupubajinuxibimak.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ksmu3m30fifpt0a1471t8aq091/14812274121.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/02c51aec29c0343f40d95f4eef13cdd2/dasinekelelivekid.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b8f021838761f7fda82c65869867ca88/xugetupapufuzepigutepip.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/gosokalarolej.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6c0313fe---movuximogixilajokox.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54839360b---gubigegozopoxivubepuj.pdfIn PDF document text
    • http://skncn.com/u/files/77083675204.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca0e82e3471d3f9e9558565bb9bb1824/98707921886.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/lb8kfmmacd3q0bpvk82ltr4sr2/61119959683.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/33002458036.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/77579149603.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/d4b1eca8e08542f3075c33c27909f136/dinowi.pdfIn PDF document text
    • http://poiskvod.ru/images/file/dusadusumavomapusede.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_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 10648 bytes
SHA-256: a1a73d41e53529285afecaeed43fe505317dcac6c4a52738569399497eb73c0c
font_01_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 16276 bytes
SHA-256: d28da48d2408593176b97b6fbba786851bb3eed96a2af0a33ea989833e1b7783
font_02_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1