Malicious PDF — malware analysis report

Static analysis result for SHA-256 733406a1af47358a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-16 23:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28852628154fe64342250a38dd7923e9 SHA-1: c53cf628e5e343a14e2c2522db94b6f6dd81c3bf SHA-256: 733406a1af47358af442a17beb987f113a4bc6ea36296c3470721d7f4e773ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://home-plast.ru/foto/files/gonajasig.pdf In PDF document text
    • http://zeci.nl/im/image/zitinudetawijotipi.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/23566783859.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff83949a53---66712581408.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/luxawexabofibufaxiw.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/55213828579.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/rapavafesujasezudane.pdfIn PDF document text
    • https://emenu.hu/editor_up/62393603294.pdfIn PDF document text
    • http://fullx.net/files/50298494597.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/76d57fc4dc798cc5714be601008d8f21/titejudokemola.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/87425411350.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/rotobikakafejoxox.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109050257424487.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/ragomorawevego.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d15515ff54---53202230732.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/nitedujewolamokodu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/28431079721.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/78750217409.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zusumavineku.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/tufaduguni.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/91025308985.pdfIn PDF document text
    • https://laser123.com/geektic/files/67357720008.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/45877207401.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juretidutijexolobaduxeju.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2ca733394acf32b861209e30b689bd08/27139460028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=indian+idol+10+runner+upPDF 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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 18020 bytes
SHA-256: 0c30272335c1270293dca6a5c072ae2283a633449290086c78120fe20dfa9995
font_01_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 10344 bytes
SHA-256: 7aa8d443cb622c9542352537026b6dcc59eec46222b4cc41daf3b6fe602f7627