Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac9ca5a6ae96eb2…

MALICIOUS

PDF

85.5 KB Created: 2021-08-16 18:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fafb8c7e209b993a5ed9dd60ceb618ce SHA-1: 2e62aa0b69fa3438d56f62163e956b1710eeb5bf SHA-256: 0ac9ca5a6ae96eb25064164f35c07b61eff590876106cecf93add713efd3d3b0
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 0.9974

Heuristics 7

  • 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.
  • 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://ctsgroups.asia/images/file/jufotowiku.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3b9f584f1e044199b92e71597b6431fd/waxowepefe.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/56245686212.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5652538962f11e558931ee1204fa13f7/wagezafa.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/wofiros.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58a9afe70---14935139128.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18b6dc807---donoxekagari.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b918a9cea9f---degefowoligadeferulemu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/875fe5b827a9bd711bffbaac955d3d32/9962340845.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tetinijuxusamijebisi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab0f931dc---49472373836.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbef32ef9---7096083438.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/rawemera.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/20028241888.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gefibadavig.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814271be92---xilugakixafakiteduzo.pdfIn PDF document text
    • https://peterdegendt.be/file/4405270452.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7d9cdaa2251241a76ed129bf79cf4c78/87770440091.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/dapaxisinufij.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/4v6ort2hdj83u41ssjqkoai4dp/93276097393.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/zezibuluwaxejuzewatan.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/jofuzovuwabuvutebolet.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31a585c90---41365566207.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/rujowenedifopomo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2bb03c2bf3b0949984d6ca3b48fab02c/padisabegid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bates+pocket+guide+to+physical+examination+8th+edition+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 11724 bytes
SHA-256: ecd7c1fe411119a1c2ea494d5bff65f84b4afa6ccff883c2939ab4fc23b0313e
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 17816 bytes
SHA-256: 1d1c7f24ef9c433d63c5b34bd2258bac380f386cb37c1026c20643a7200428bc
font_02_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1