Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3786ac012e4e343…

MALICIOUS

PDF

95.7 KB Created: 2021-07-30 07:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 8ffe7c2785dc44f8542f36af1e5d6925 SHA-1: 09d1766cda5e6c66b315683f55efe03af63bb3dd SHA-256: b3786ac012e4e343eda968d33510f9dca13f6a818fd20c98afb38fba0a060d9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://burstallconrad.com/editor_files/file/50599818574.pdf In PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/luwavu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/sowewavakeg.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160721df7109c5---69047914799.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010961e269---96958000559.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1e00bccd3a3666705349fd6e15d48308/gojewedilufotimavovu.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bs4q9lkag98ppbe25shchnpumj/petozufurugodakakexu.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/49304787140.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ai3o6cgncb46jnr4h6gs32vdf2/famibemesalomulifiguxupez.pdfIn PDF document text
    • http://landpas.pl/upload/file/69784155801.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5d1e33e1c8cac23f9b4281a1caa378fc/82315181133.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/9800708385.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4fcb66d70---bokutiwamanuwofebavizo.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/7a4956fb2625dd797e3c4c9cffe8f5fd/27872469136.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5019bee32cfaafd57dd0b19e727eb734/17962586417.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e427a7a9f---22380954552.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f6d26d5773a181c1fe7695c03cc4a6b4/surubifapeneduwew.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e10ab6f0858146ed79237175e88c25c4/91739000887.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xutasoxelenogifub.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847dfe76171---70119968537.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61296c9ff---lelolubogitezisi.pdfIn PDF document text
    • http://skupka23.ru/upload/m/gonon.pdfIn PDF document text
    • https://electroagro.es/pub/files/segijedofakoga.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/20421269410.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/1849130304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=back+to+the+future+2+full+movie+480p+downloadPDF 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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 18312 bytes
SHA-256: 0667ca92397776eafe93ad0c89cd1a1ba0fa0c663bb1c205dc2cea84b11bc8e3
font_01_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 11640 bytes
SHA-256: aee269cbde31bfa7d4fc90d03f3c658cf096b5410faa1a91a0f3a1651cb592e1
font_02_sfnt_off00013fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000157fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FE 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467