Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a782a13057347c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 17:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ceefcc4bbfaaec7e7bd1ba4625589ce SHA-1: 6f176a15809dc1bc39656606bc877e44eef11136 SHA-256: 79a782a13057347cbac0175b7b60df70f9e6f79165012eabe5f0b09c9c1407ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs to execute code. It also contains numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://queure.ru/uplcv?utm_term=unseen+servant+dnd+5e PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fa1cfa9f---pifujujad.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/26696910220.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613150fe76222---pifova.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a5cf4fdf954991444d969c94af3594e1/82631748969.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/tarojuvofebeledepi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139659adb3d6---80246432283.pdfIn PDF document text
    • http://thaide.org/userfiles/file/jilogome.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/satilisirowo.pdfIn PDF document text
    • http://clickvay.com/upload/files/zolisanexufimiwas.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zufuwuluvazugepef.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/mirikojedowinesipeki.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090421333022.pdfIn PDF document text
    • https://majubesar.net/contents/files/41196852080.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/rorumidig.pdfIn PDF document text
    • http://montesantangelo.it/files/files/midifadebela.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f0fc0434---bavowiloparovut.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tiwatenidoleza.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/pisamipofibezaz.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/54120927953.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/14056582520.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xomawifurub.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133f84f24426---37436835882.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/52952147370.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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10192 bytes
SHA-256: 14c618e6462ed8290b45bc1d04a95b2ded03928efedf9a23811d27c7493cdecc
font_02_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 17068 bytes
SHA-256: 646213298150ca313cd445a268ba3b162ffa01221bdae4b5304283cbae20eda9

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