Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6e7c20917b00d4…

MALICIOUS

PDF

89.9 KB Created: 2021-09-10 09:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae4bb510f4e487d9d6ad51833b633a2f SHA-1: 7b60060d260a7e14cbcfa704d4852c0996690a92 SHA-256: 5a6e7c20917b00d49d8f22b4e287a418e3deebdbfce1a86a66d18235cad4a179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Static analysis revealed a link farm structure, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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://gediklimakinahidrolik.com/resimler/files/zikewofozejuvexafofum.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131743b52fc2---37147492364.pdfIn PDF document text
    • http://dentherapia.hu/files/file/12594761167.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/wivumefakixezej.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385df181e7e---fijukige.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/tuforedebugijiloreduz.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/nuvujadopipazoroniloz.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/8531314494.pdfIn PDF document text
    • http://sro52.ru/uploads/files/subemakidukixugipixuvefe.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/lokaf.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/7064607425.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/af261d4b5a26f750ca3966159249386f/kokolagoguxudosinu.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/85053079382.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/10537545310.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338ca32fe5f---56091147218.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/venokerometifejusukanek.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/jegafojuguxukiwegiwaxo.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/46914117429.pdfIn PDF document text
    • http://recviem.ru/img/upload/25646418696.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/86786447057.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/lalidufitoxiduzodudag.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/bb7a8c73ab1d0acf0dc885d2c2cf4f3a/dopol.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/rinuxixuwerim.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/64749264829.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/92373982138.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/92721878955.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/57424421077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=surya+pranam+mantra+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 22040 bytes
SHA-256: 7710e7ccbd3555140359f2ef7bb3b8ef39e3bd1d8b871c2b5cff283ec5997d35
font_01_sfnt_off0001202e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14041 10868 bytes
SHA-256: c1edc39961376fa3fe0cac5f4d0f56927fa302e0a133227a83b5414badfae3c7

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