Malicious PDF — malware analysis report

Static analysis result for SHA-256 a407e8f1ab13ad39…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 04:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d68cdd3c882797f258c89d09bdaa233 SHA-1: 706bd8c332161c5d67df0e3417186da83372c6ea SHA-256: a407e8f1ab13ad39d46187cc257b429d104f6b5aa0e3d09f1bf2a20d36ae58d9
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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 http://jpsacademy.com/slbdavbatala/userfiles/file/betorovanipolimexu.pdf In PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/subasawitebana.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e975d44df---pilup.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/42835168709.pdfIn PDF document text
    • http://prompol.com/media/file/933725954.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/aa896928924dc82f9f412eb1f94934ff/zizarixeverasover.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/latagagagope.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/10625210305.pdfIn PDF document text
    • http://workontext.ru/media/file/lofewozefekumogak.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/80295633044.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/40576038792.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jemepimapigukiloxogin.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mijomomovuwitulubuje.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/gesozuw.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/64360020921.pdfIn PDF document text
    • https://titishop.co/upload/files/52955244089.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gataj.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1bd59286---milejet.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/popifusa.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/20366777259.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/47065545659.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/pixajizelesoxoje.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/69672434083.pdfIn PDF document text
    • http://reylab.com/userfiles/file/sivakef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=swift+streamz+tv+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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 18356 bytes
SHA-256: fb14c95aeb803e296a19585c0449c934919f02efa2eb1d530ee9caa37dab4f3d
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 10804 bytes
SHA-256: 6ecd9effb0b99072bc1c9d152b383883c566c5baf33e3b4a93282fb61b1e3f24