Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7b26dbb19a0db6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1cc053019ad931c440847eaa334c25a SHA-1: a00ec71b6e2a10fd4062f31ac711a58b807924eb SHA-256: 3e7b26dbb19a0db67d5cf839285943e25ff85ac9bebee092ef4dcdc2e1487a19
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farm heuristics indicates a primary function of redirecting users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=snap+video+apk PDF link annotation
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/a4a5vgqveind7d7u4qah6vev06/13849884095.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wobaxojugunata.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/mupadenibuwemusitujixux.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/vopalekedomolofulajonuwe.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/77158869404.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109021723278175.pdfIn PDF document text
    • http://linza-market.ru/upload/files/jedaloguwilifa.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2da427ba1b4c469380ec01ebbfc30853/zojegelufukinazuwow.pdfIn PDF document text
    • http://torgoborud.org/images/file/24630407244.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/43409614510.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613704b34f33d---fozejafugodunowozuxolozo.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/31467972513.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/9550854093.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gafivorab.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161309d1a72d32---walesuzukadulakojesilu.pdfIn PDF document text
    • http://oncallanatomist.com/ckfinder/userfiles/files/86591000119.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/03f35cdc61451ded031803bebbecca89/momosatafewifakimuvi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tulegagezi.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/bemagipakeda.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/51542472525.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/17411224271.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/68739546207.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/kixoso.pdfIn PDF document text
    • http://starma.pl/files/file/rikuzumabakumufabesazola.pdfIn PDF document text
    • http://sbairs.com/datas/files/noxigafo.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_off0000b30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 17704 bytes
SHA-256: a52a04fe113ff3d0f367af9e64c1db3afa7c89324ed48e3d3b5b3ed841998113
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 10208 bytes
SHA-256: 789751d2d97954bf1be66e676ee9c428706c74045ca7a1d828603057c312ae2a
font_02_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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