Malicious PDF — malware analysis report

Static analysis result for SHA-256 5747085efa0a7b34…

MALICIOUS

PDF

84.0 KB Created: 2021-08-26 00:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c1c73e9b02fc27c6197b132ae7e0298 SHA-1: 739189273b66199b45ff10de5bdc3a95e41a7c8c SHA-256: 5747085efa0a7b347354fbb00d1927c216040975bfbc7b791f121c06b5aa3230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external websites hosted on potentially disposable or compromised domains. The document body was unreadable, but the heuristics indicate a deliberate attempt to obscure the true nature of the links presented.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mariondhuique-mayer.com/data/file/kevudafipolelixujisugi.pdf In PDF document text
    • https://cryptobasics.biz/uploads/files/woxenobikozi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a832a9e8b0c---jivababiponobomewi.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/muwifosezujoreroti.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/77830695513.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c7fd1c83---7040998818.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/kv893n5or127mrddl73lmhs7gr/51815627891.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/095fstve8cppss4307mk5tbp50/44420430582.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa425cb5ee---58989534346.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866b49ca59b---giwapojipakunozegus.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/54516d4090fd998050c85bd87dd30fcb/fabawegapufozinedoni.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/78569405867.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/jakuwus.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/lamizomos.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wusepemotigafi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gar3mq6ug010e3mq3af8vtgfk4/kekasifazuruxujesa.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/kaluravepizaxipipex.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9038657a9c08e1c449a2e9c2f8ea53ab/tosexobuxuvokukaxaga.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf904a6ea4b---37125681794.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/zaraduxawekujagim.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/duvobuxakemipigumor.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827d8f6d303---balasumesivuroziwufaxa.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/88066089549.pdfIn PDF document text
    • https://incense888.com/uploads//files/202108030616358263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=put+something+outPDF 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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10348 bytes
SHA-256: 6e8e56ab09fe9a65670c2ac1258cef3216dc14ff46846f43072fd5366a338ab1
font_02_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 17912 bytes
SHA-256: cacd768c5a81812cb03c1e3e5dc36a023b9795a6c1ca55ec8af6dd56d4a5e9c2

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