Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54b4e3f17f452d3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 19:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75c6e896e5756e7ba5f698edbd69b64e SHA-1: 8843c2d64f5f3894d0947b9596d9de387f8f12e3 SHA-256: b54b4e3f17f452d38346a5b7955efdff6557ae52eb427a7e25d6c948af9130ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medvor.ru/uplcv?utm_term=cheats+for+gta+vice+city+apk PDF link annotation
    • http://zit-tech.com/userfiles/files/vafonamalib.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/foveji.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109122212393387.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630619860.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614456e593912---41904191918.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/49257629167.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/93028371271.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/88801828222.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64e9cc73560e4486f2b68ad10e0a2fb3/26708660010.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/16002148025.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bde4a9371e---49434442204.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/57254158020.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b54a66391---37083247722.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/nuvafoxatoket.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/54659980490.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9471d73f---vemojoradaluzikarijawox.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/powomesamefezepisibo.pdfIn PDF document text
    • https://laser123.com/geektic/files/bidevotul.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/21649708828.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/99465836612.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc274ee774---warev.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/16241964784.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/rapipi.pdfIn PDF document text
    • https://alariel.be/userfiles/file/sirugosuma.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/45317109089.pdfIn PDF document text
    • 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_off0000bb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB63 15960 bytes
SHA-256: 34a1b858e73d2d23c7c0b5517a86841afbc9b4b049e5115c7d976115ba7b983a
font_01_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10912 bytes
SHA-256: 1221266962096f330499bd0cde77eb74b863421cccda5a1766440bea37f71edf