Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd063e45ff1954b9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 12:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd5308c35da79011b3ff7c34d60bbb89 SHA-1: 11d57e87ad09d599b6ac5da7dba103202f91b3fb SHA-256: fd063e45ff1954b995ce03dd6470ae0ac6804f3fe69f2d7ef41802f0c08b15df
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO poisoning campaign. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vivatbacchus.hu/files/file/89810112443.pdf In PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/58294299675.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/febdde2624fca315b90b6eb18153542f/83782951724.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/xixejudovejepuvu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb73e910f44---rawisabofusedufirujupomod.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/luxutalefuzi.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/rizinekonux.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/bb35d322fdc0a553217102b5e33a0ea3/pipoxaji.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/xuwura.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/26910635578.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/98987945214.pdfIn PDF document text
    • https://gangnampools.com/contents//files/patusawusit.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r6kvjuul7s9qs37ol0bdit9td1/kuvexet.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/kidukobow.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/feliwofopomeg.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/kobojewepumosexe.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/fovaxuzonisutajuj.pdfIn PDF document text
    • https://codecs.roimages/file/bopomutafaxeku.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/kolavatunosapa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce575db0b---mosajukumepuza.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/f02e862afc91214ce244675415738c45/wotiveronuzizafakiv.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4923ce18---51479825173.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/kokebed.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/vonozuxasukag.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2c5060d1e9abd0ce73fe774929988cbd/jamotuwonomef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+viewer+kya+hai+jio+phone+mePDF 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_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 10940 bytes
SHA-256: c9eb568de052cf326de2d574b4c14ad93e1d0e84f3d9be994960f3726dc916b5
font_02_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 16880 bytes
SHA-256: 79ecde8f7a73ef277c77cbb2dca5edbbc525fc364300b5f51f2a668330089f8f