Malicious PDF — malware analysis report

Static analysis result for SHA-256 186db3b1a566fbdf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 06:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cec3b31f1e0745eeeea157ce1a8c74c4 SHA-1: 10a2f14e1eac2b70f9e5f7e82fd2856af27dbc0f SHA-256: 186db3b1a566fbdf5550ee6c52ba9779ae4e146cc2220a62215d64aa7875dc4d
176 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, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, with many embedded URIs pointing to external PDF files hosted on compromised WordPress sites and disposable domains. The document body is unreadable, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=pray+the+holy+rosary+for+the+dead PDF link annotation
    • https://gulfsupremesa.com/ckfinder/userfiles/files/63471083713.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/kadadarokewofizosufakol.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/29557384175.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/japijowupirewuvaxesura.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/64628623913.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160702befc70b3---80095188168.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-7/20210607223920678453.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881ce9ec84c---tamabamizotare.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/61679546349.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/redakozugogekasenedo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953a1d7ff3d---somulu.pdfPDF link annotation
    • https://questyme.com/userfiles/file/teberojitetafogujesakekam.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/38399378020.pdfIn PDF document text
    • http://gnox.vn/upload/files/tajozatujekokotavixifuxor.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e903deb0f5---demafaxu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0051e5e4---78333525656.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/namudakoweku.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/92413129794.pdfIn PDF document text
    • http://art-ball.net/files/file/77534042875.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp3nlou66fv1s3ims0voftkne4/magekurinozofexor.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/65443666075.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab288679f1---95180166598.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083df271fd2a---refefufuponi.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/mopepunid.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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 16940 bytes
SHA-256: b59cf4be1c7400c743fff33270acc022a8286604518606cefc713fc0b96768ee
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 10372 bytes
SHA-256: adfb211e7ff3cab1a20d6f2c8e7a5c0ed4996ccc64f34c9006d360f44599906b
font_02_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1