Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e9f56f2e1b336f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 05:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecaeacae14ceee10e08b9cd91ae30c12 SHA-1: 87b1b9d6076695d9d6bae86653eb262d142c9444 SHA-256: 95e9f56f2e1b336f31bd76955029f57a3bcc4f0eb46542fa4f83ffddb79c3e25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external resources for potential exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=top+best+free+vpn+for+android PDF link annotation
    • http://kargo-box.com/uploads/files/72323124700.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/85112703340.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613238ccdfdac---dafarupudimelisem.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/bisinid.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/jotijulafigesabujuvu.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/joribudubopigus.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/nifujujutujukajibujafu.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/wosoruwufoz.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/8992333725.pdfIn PDF document text
    • http://fruitvita.com/files/files/95419323646.pdfIn PDF document text
    • https://promise-land.com/upload/file/71553313442.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210916_084411_1805.pdfIn PDF document text
    • http://sial.pl/galeria/file/ziwilegorifetikukolez.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614123a958dbf---37238511509.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/64117560569.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/kedesafavideji.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cc5ef9aaee2487a4e23856267d6d51a9/50846925620.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/kumusimubemit.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/80910464861.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pemuridulakikixuxoro.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/xeraxe.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcbfeb6ec---33865764292.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/91125943607.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/14973781598.pdfIn PDF document text
    • http://minipit.com/data/files/13822850506.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/tevufeforojolim.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a2012ea5---25187528556.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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 10616 bytes
SHA-256: 00a22b0521f25bd771c582e5dfa9e1256ccf5d02a5c6d29f02ebfaf88a129a0d
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 17028 bytes
SHA-256: 44f49014f7c01cd55d0ce7aae012f7b97ffcb35a49801fe3453839402d86d287
font_02_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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