Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c91903ca26d821…

MALICIOUS

PDF

86.7 KB Created: 2021-08-08 02:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cff92cf2a2d78011a16020de480623b SHA-1: c38747b13419b9f9fe2a1f4ace31e839449895c1 SHA-256: c7c91903ca26d821d178292e8fc817a779e6a68230be4c80dabd0202c202e4eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and IP addresses, likely for further exploitation or malware delivery. The PDF structure and embedded URLs suggest an attempt to disguise malicious content as legitimate documents, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5f95156642b2547f9a6928ebfcd6f4c5/17096194077.pdf In PDF document text
    • http://ventilatoryzlin.cz/images/file/7115935572.pdfIn PDF document text
    • http://gabortech.comadmin/file/9924176432.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/bolam.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cffa3bd078f---74946295703.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/354807f3751096ed97733b1b37f72455/dogobefajesulenalivu.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/jawibodolu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f839aeb3d16---24406896598.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/mifemipaturawizobuses.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c022362f55---52035945175.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/77742354347.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/ladakenoxadukimok.pdfIn PDF document text
    • http://goldmustang.com/files/files/58034337345.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d6f01037---23542297799.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/tawexuxabevotiwovisabenuw.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075995553374---18209263656.pdfPDF link annotation
    • http://aep-tc.com/cache/fck_files/file/9207790575.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/82087703379.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/milutuvoxikemosuro.pdfIn PDF document text
    • http://princeverma.in/uploads/files/fubixegerewezefubaz.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/901ddf72241538e5389d85b2bc92dea6/73492190055.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/17468837046.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e188e2df---kujofojosojoxorawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=colour+blind+test+images+with+answersPDF 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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 17384 bytes
SHA-256: ae27f9f64aa0a1951e458f070be41f616529344e60c1709cb71e9c0d423788e9
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 11052 bytes
SHA-256: c9db12de491d9c81a55a4a04be3ca1bc1fb38a1af29e617318a3ebcfd580c00f
font_02_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1