Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f621ed869bbee4…

MALICIOUS

PDF

93.4 KB Created: 2021-09-18 08:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87729899994d605414b9309b32c96260 SHA-1: a84fbeb2865c7106787781fce8ba12834c01dba6 SHA-256: 50f621ed869bbee453f360b12eb32d4d5d0db65d672d2e1545821781f4a1b31d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The URLs are designed to lure users into downloading files, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=minecraft+full+version+apk+free+download+pc PDF link annotation
    • https://salvatoredivilio.it/userfiles/file/zowututigigewaf.pdfIn PDF document text
    • https://matricula.arendic.cl/files/kizidil.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/71012092801.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/34428858085.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/77549038000.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/gakijolizutabababapiwuva.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aba950d50141dcc3b0bef37ae2972373/runuxegawaxud.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/zanodozigesifumog.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd57a5e8e---49650545662.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/doninopiwo.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908131219545741.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/jarobuwifipasuzobiralo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae51f24fa9---16758977359.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/zoganetelarefeli.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/94012766861.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/zukadexi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5cc81d9d---57127656646.pdfIn PDF document text
    • http://flirdining.com/uploads/files/fetosibox.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/xovagakituzajofifudog.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/966473764.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vonujoko.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/wugut.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/mumapubamosabebekase.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/51533965643.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8c5f0bfec---91003321557.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_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 18624 bytes
SHA-256: 8a6567516521bd489d62300f6b589a40fbf4dc5062dff98bfc36fa8c724301ba
font_01_sfnt_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 10952 bytes
SHA-256: 37abfe5bb9fea6a0a93b9bce0924688397ff2f6d3829f18cc4b277be665b4d96
font_02_sfnt_off00014f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1