Malicious PDF — malware analysis report

Static analysis result for SHA-256 f986d05893537951…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 04:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ae4a20e7158668b3d6665e9df0d7dd6b SHA-1: e19528bc3d9a305afd96dd1b9401024268efc231 SHA-256: f986d058935379518a151b1179a13783e9b7388cf5073205dd99327102617151
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/56212242396.pdf In PDF document text
    • http://khonggianmang.com/upload/files/46368584557.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/bewilemunu.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/15552542183.pdfIn PDF document text
    • http://orderkai.com/uploads/files/kalagivanejefupemenijuka.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/45403775920.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8eb45aa2c---74137060876.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed46a0938---piwutozuxi.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/6861199694.pdfIn PDF document text
    • http://videocycling.info/files/file/1428252547.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/29870740757.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/184hgl89dtr6spiiq461ecr5fr/mezijelipozobija.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/vojonalunowoxebax.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/39352939263.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161108244c2c87---3308086363.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/79d05e1459d6818c617f7404207c5c0e/xexoxikavif.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/padetelojaduxikem.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/tomubos.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/pekejopasofom.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/95887376857.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/79065287157.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rizepudoboz.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/43b8cc2e6859d937666edb67652e6390/51366115822.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2aa9fb4aae5e7e92ea5a016ded05c6ab/walugirusijizu.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210627072550.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/82960536553.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/tupoxuwagejudud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=conventional+monetary+policy+pdfPDF 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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 18252 bytes
SHA-256: e5cf8347a91f2348a8d83bfcde95e2f20ad7c402f60723af09a500378fc3ccac
font_01_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 10824 bytes
SHA-256: 419929d336c8a78f8e713bf2285ac692d1bcec21274c7992312830620ec4aec1
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1