Malicious PDF — malware analysis report

Static analysis result for SHA-256 837fafa508e26128…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 04:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c925f5c4c6a6f27f180c2e1b17d125b SHA-1: 9f016c5fcd4ade91a081b12cf7606f885ac03a7e SHA-256: 837fafa508e26128b99fe3f62bb6ad458867e9622cd41eb359e4d4ffe6599dd7
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sonarkella.com/userfiles/file/56853482616.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16148cd1b9ce61---62034882476.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c953e16e19---miwubikinilibojizuk.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/61805426590.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/tudanarupijexivafin.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/61828321148.pdfIn PDF document text
    • https://webmenuplus.com/images/file/39503852895.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/pebofaza.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/76797215031.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/62320962844.pdfIn PDF document text
    • http://hingliltd.com/userfiles/kibasatipikozesitanorega.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/mojuzunupi.pdfIn PDF document text
    • http://sangiaodichlaocai.com/upload/image/file/gerixofobifes.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1632350661.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614892656e747---fegexu.pdfIn PDF document text
    • https://ags-car.com/upload/files/16480505016.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/891606788.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af0067e364---90911083553.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/70717629413.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/pesunuvobajufanozakenoma.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613897d62328c---xeranogugifexuzawe.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613472e09d2ac---bukamibopirigugoveroweku.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xigiwoterititipisubozot.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/38442633657.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/puwelekedekujuvadojetelon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=spooky+scary+skeletons+roblox+idPDF 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_off0000b3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 11028 bytes
SHA-256: bbd9528362d73a165aeb18dd8fd7f158e3af035bbf7fc4a8162b3f62eea391f8
font_02_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 17960 bytes
SHA-256: b8be159f343d68057c136265e7876808c257ef924bd97291a71fbc0cb256272d

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