Malicious PDF — malware analysis report

Static analysis result for SHA-256 617a99e4620ddbf4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 09:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 78e0aee0f0c6159ac290b3e9db5fe8ce SHA-1: a47a1da039a055ce682f05678db906465f7de6d9 SHA-256: 617a99e4620ddbf4d384889ff727669bb47f9323a68781422049c8653a24dbd4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://milliondollardesiclub.com/upload_files/featured/files/65973443375.pdf In PDF document text
    • https://atlantidegattico.it/file/28541726100.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/jalifomesewulapedajiri.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/bukabibupezovifulas.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2c4282b7---67638081482.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xukigogamevavetonuzoxo.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/fukatitikepivenizuwewa.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/duzikikonuviwimu.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/37937968792.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/wogowifaravixopuj.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tuzejazorifud.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52eb7ef31---bulodigetejo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/subujagagik.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/22600423372.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/zuvosoru.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/zetomotinagafe.pdfIn PDF document text
    • http://cke.hk/userfiles/84853587637.pdfIn PDF document text
    • https://ratosatu.com/contents/files/dixuzupudosutivifi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140b95da8e06---21643898897.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/974bd630ff686ef67d21c3bbc26e584b/zeligijetunujeju.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210911130228.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/15800619621.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e07a33f4e8---juwoxivile.pdfIn PDF document text
    • http://alkanboya.com/files/file///20196268162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=www+rokkr+downloadPDF 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_off0000b019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 15492 bytes
SHA-256: 62a9383e6121fc9bfae89e2ca13b6dee6d2c2f24950f3645a361040b7637d4dd
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 9920 bytes
SHA-256: cbf7e58b3209673cf40dd1353cd0743a8ed89d92cf8a15fdafd4c5eb22f992a1