Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92e622edf5b0182…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 14:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20f1aa6083e9a48c5e6dd56c1ef30636 SHA-1: 0554397e3980254abc8665ec6161850403bbbe1b SHA-256: b92e622edf5b0182a492a84a122183acdc5bbeb5ef7527c97b20ac86c8d594a7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, which could be for phishing, credential harvesting, or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://silver.jo/ckfinder/blanc/files/90679152824.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b362cbd8---22631703769.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/52538463960.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161393318cbce2---tofiwusufemifivivet.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/52145414848.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/zodiz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143927552fa8---lapepudi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161400c0dcaf00---64989358761.pdfIn PDF document text
    • https://pratham.one/file/detukad.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb27eccf9---malejezuzowukuvafu.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/midof.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/41958725659.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/56133662142.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161360ec554bf1---3754803935.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fukoviwiwudosusamomosomam.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/60635569513.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/92148455924.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/680d351d6f8cb4dbe57108ecad609f66/ribesumodupuxivijedoba.pdfIn PDF document text
    • http://gr-chem.com/upload/files/xajopazikulutago.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/riwobetamip.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/batezoxazimotomiruzukawid.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/23661368316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+listen+to+music+on+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_off0000b9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 17176 bytes
SHA-256: c17114df050c66776334e50e542fb01890d9a4ccdb2ff525e9690da312084b41
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 10708 bytes
SHA-256: bcdef177fed891e789e7278c8dfc026113a122c71014f9499641b8b48c1d3db1