Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d87a80a5350169…

MALICIOUS

PDF

94.2 KB Created: 2021-06-08 22:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d276288e056097f9b3e88bc274c8bc3e SHA-1: cca54af0427d2bc52f2bca73190ad91cb8adc10e SHA-256: 27d87a80a53501697536731dd00a86c794e3cdbcfa5b888eeb095232f78c37f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://infrive.ru/uplcv?utm_term=tu+es+partout+saving+private+ryan PDF link annotation
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fe4c24ca---debeji.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/2vaknklr2bs7sgiks85qeoljoq/77507829692.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf93a33f8c---33580497204.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad0d75a1e---pilogekodusapotaw.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d904b2199f142fa175bd2350bf9bcd5d/77564116203.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pixikudenifodowibepap.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ctctcfcv7d4p8hnajsgm9abqg2/16533279913.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ou4s5g0p6ccpd5k4j5ucf2ufi8/80229405815.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/53f17812f32ea66ac2831491a7508df7/29254862392.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9a8f0b9b---pulelekatatepolosedugute.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160741edf3983a---4621408662.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ffbe3c611ce144ad8873a4d747ba8de1/mutonedaxagutukek.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/dvgpnc1k8u8k91c77mkukis67s/55501978644.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bc45c87ffc5e3922fa5ff5949ff52b91/50853729658.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1hor5mci9o6c02stq76tfvmcv4/72256246251.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/13772066847.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q3l13mvsaliao19cvah5uj8h91/bigapevazuzazajexo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 5064 bytes
SHA-256: 70f89f98c799adc33b4afbe2399f2973cb2d8c8346609509b4d91eceb2974ea4
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 12304 bytes
SHA-256: 13c1978c3f2d8a7df611d72a7e72eb8c678cd71eb19e9f4f1f8c3630abb32593
font_03_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 12216 bytes
SHA-256: abedf853272480abe12571e385ea3e76a3a272420d2159523f56bc1eea2bed53
font_04_sfnt_off00014ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA5 16256 bytes
SHA-256: 0c28d55d9957e5be45f9d3302843a1d8772fc4e8a9a81ea04eed1b5cc2016f23
font_05_sfnt_off00016102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16102 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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