Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd9dec7d73616c7…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 09:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 438b2d15fabd35ceafae07343db2a759 SHA-1: 524d74e5c1faeafd9eebbda092d365dab50d84a4 SHA-256: bdd9dec7d73616c7033d66fae2e5622aa9bdef7959edc48c28b6e22241de8f3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.wroclawmodelshow.pl/ckfinder/userfiles/files/sajamitejagimamiwi.pdf In PDF document text
    • http://kamnitikamini.si/upload/files/lufoxiramalazadima.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/81670717201.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/94842280176.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/gixoxuvunasupikemebiro.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/zopabijufojifidifa.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/8154685562.pdfIn PDF document text
    • http://dsraxys.com/uploads/julilunis.pdfIn PDF document text
    • http://boldogelet.hu/media/taraxavupaxani.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16156abfcdb7f7---gisopomupevoxakusenanebu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156d712a1f62---89195523619.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/13392217397.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/85471281582.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/tusolesatezipudim.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ab693c220c6fd7e4924212a7ce421ded/pimewisarolun.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/munufosegivimamakinato.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/27288811441.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/pavojivovexogimimon.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/panoperobomibovefukijin.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/gokadurexefebuvano.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/wufotorigaso.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/sajikuvetapefopekel.pdfIn PDF document text
    • http://retailcop.ca/files/woneginewor.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/14445895249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=low+lactose+cheese+listPDF 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_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 16220 bytes
SHA-256: cc4e52aa8624b6839a58bc1bb032faa2c4e9c2d6476a6f3120227f1978cbd951
font_01_sfnt_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 10164 bytes
SHA-256: 6a9f6e4abdd510c49b3944b2c2203a953f3fdab10e6d80a5140aea94880c9cb5
font_02_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1