Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a002f742348e62…

MALICIOUS

PDF

74.3 KB Created: 2021-09-25 04:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 232591b6c9f5477f827193bdc278306a SHA-1: c6d64738e3448c1aadcfffb5e6dae43c360875a0 SHA-256: 92a002f742348e62d5aca2e992c3f0dc8333d710dff53b789165e77c474b775e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://boxshop.mn/userfiles/files/42852999542.pdf In PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52776090885.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/56996777129.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/letunofowumojijusekometiw.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a54ee1533ed5d89947747d753eee3b53/xetexokasavanubatewogaj.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d164805a61---96793870098.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911150241388.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/sinebugabuwavinawe.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/68316049298.pdfIn PDF document text
    • https://andana.us/files/files/rixigixidamijiran.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/51099503693.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/39647422365.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/17710126883.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/regebukebizuduxunijuzul.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/fubasosijim.pdfIn PDF document text
    • http://3q1p.com/upload/file/210920041155997752lrzhgidnu6dz.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d933cf103---5654346390.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16318809858462.pdfIn PDF document text
    • https://o-dance.dacola.com/upload/files/bijugogeva.pdfIn PDF document text
    • http://ruihuitax.com/files/file/10359752008.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/nalesuwararovafutekez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=editar+odt+androidPDF 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_off0000bcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 9880 bytes
SHA-256: 39540ac4fd3e2ff6ac26552501f65631e38b1fbf6b5af9967fd6fc4811ed4beb
font_02_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 19076 bytes
SHA-256: ff28f1827173310c2ffdde1039b5db3711dec78ef441957b06edb704518b0bb7