Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff4f9ab45a72afc…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 09:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3256643dacd18a80e5b0de884683df1 SHA-1: dc5d65cfb549c1d9cf36f39c31a199376036958a SHA-256: fff4f9ab45a72afc0bb29e426723fa439a336727fc6a675040dca637f7423e1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=i+am+james+fortune+lyrics PDF link annotation
    • http://rgn2u.com/userfiles/files/98468714074.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/dulafovoxunusas.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/lomipomepunaletosekoriron.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/bokifefopos.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c7712580df21873e152a7b1e63f21cbe/39546493789.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/nivavisusadixisuxasemu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fofemuzujamugopolegimi.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/putenidusofitedarusebo.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/bobebiniwijusi.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/11273042093.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/xesezutep.pdfIn PDF document text
    • https://basisnomor.com/contents/files/tinugixu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a9f44288a---44941404744.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/36901593960.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff1ad7c85---28370622996.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/17833088238.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/zonitedevawapa.pdfIn PDF document text
    • http://tchid.net/userfiles/file/94317714651.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/dukubigilakuverekazoxime.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/80790969482.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210908_061943.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/5224364203.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94413091083.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_off0000b18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 10792 bytes
SHA-256: 5a05d4f0e16fa1ab8af5e8f44972a3b944a8125145fc98edd014de9725a81844
font_02_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 14900 bytes
SHA-256: 23f1689f01ec5da78a391e47a2d26188c009a8c3c4e2cb95c23c624a54c72560