Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4921b957bc53094…

MALICIOUS

PDF

128.9 KB Created: 2021-07-01 21:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: beca5c62823bf5b0c065851f10fe2163 SHA-1: e3e84efbec03fe3db7f74679c043c525aa08ded5 SHA-256: a4921b957bc5309492834723058f2ea8f9a0c995b2f7a37d7ab7118c068f36aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The embedded URLs suggest an attempt to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59ae6b8f7---63931869077.pdf In PDF document text
    • http://www.hussco-steel.com/husscofiles/files/57427198271.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4da020db0---10688339858.pdfIn PDF document text
    • https://actor-conseil.com/files/file/wuvoxanamopozojosu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609915283b748---56489016974.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/litugadakurowob.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/jbitf7uslk2h0kvutl6g6in0ic/51245212636.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c939ceb74e0---sifeva.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/wavalugota.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/nimokufi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c55c85c2e---logosadabuf.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/20267607738.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/e96f252454c5f681c5f03cad995e0fb9/xowokefumemigijijumozu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caeb789cae2---91078445194.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/32335287577.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ndr0o9g16j204kffm7flps3gs3/kipatezabefesoxufupoxigu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6a7ce66245afc7ecfde1f96264d00a71/raravez.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5c568013---dujejamugogudo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/umnbquevgajjveaf8qkmt724b2/17796195190.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p4210ffn4g9rsq7h7n001f9r32/punixidaruvawev.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/e8dl3m1u6ljqbmt528uvk9frf7/32231320168.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0781bc64d1c7ed4fce6779bb70c05e02/jiduvogipologuxewar.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/watedoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=combustion+of+ethanol+enthalpyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001913e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1913E 10908 bytes
SHA-256: ea6cf2b5dc4d667409eefab8441a9bf24508f7edfdd069ecbafb3187ea681313
font_01_sfnt_off0001aa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C237 19180 bytes
SHA-256: b967f79190fd734e29a2a9fd627d1f6d15328ba1c8ddd6192611be2739b89876

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