Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7a29b6e4179c10…

MALICIOUS

PDF

96.0 KB Created: 2021-09-02 05:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b564639f6dbd04fc166cb73e168f26a4 SHA-1: 6dbc647c22f89c0632c5209aa1bbdfc88bcb358c SHA-256: df7a29b6e4179c105d0d136c1c002862198ad6bf92847ed06471776d203969f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm, directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and the nature of the embedded links suggest it is designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16119ff19b39aa---47688979310.pdf In PDF document text
    • http://chromatographvials.com/d/files/3363118452.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/6639275657.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/45575984953.pdfIn PDF document text
    • https://auto826.com/uploads/files/61344842383.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/76731746742.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ac5881867643e91593a56294408b2273/nimarelep.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/wakejapose.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a14a2810---laxudu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceaa916885---duxexuvuleremax.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/30851288971.pdfIn PDF document text
    • https://12shio3.com/contents/files/28637527725.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/siposuzolomu.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/mapuvukomifopopoxa.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/9271730442.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/bobagugerele.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/281d207aee163539cf106f1c31b5efa2/vedelusez.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9fi2opb4vi916t67q7ikls4jai/lupafaxedifuvagomifivo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/nonidub.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/8418512899.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16118a17c76b45---64694367491.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f4d2bc6f---85106350669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=types+of+variety+in+artPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210819/16293765627811.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_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 10448 bytes
SHA-256: d9c13305f7b318e26e564ffad5faa2e2d62d56a63af7b7d34dfd9e799c0f12bd
font_02_sfnt_off00014055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14055 18840 bytes
SHA-256: ff7fe4db5b3af5b4c3e6733c18613783d33ebcb79d63f53b682fec2083650205

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