Malicious PDF — malware analysis report

Static analysis result for SHA-256 347c07b02da005be…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 04:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 196b3046e42e733f973ed3f34c026117 SHA-1: 731731d1319ecb9c0362031481aa3aedf06e7d46 SHA-256: 347c07b02da005bee15e718f45656a640ad37c2b26dded73971da047ce6f5e05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=structural+geology+textbook+pdf+download PDF link annotation
    • http://mikomisushiwc.com/uploads/files/1150839306.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/46724864600.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0a11258f6f06392ea9134fb7da8cb030/nojenat.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/47355259787.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/lijarujatara.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixugalupaji.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/nopafif.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kunaturegoja.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/libozimidutujofemipekodot.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/64152054602.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f2310f24b45---bawilevufixetali.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/vasekukurogavasevoxobubog.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622282745.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/30293546038.pdfIn PDF document text
    • http://yuha.be/_files/file/xubixapimupav.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/19418159485.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/am989bptge2tanlq8rm4jbc15p/zepagososux.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a1f34a98f3a385cc11c3883531351eec/53002254715.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160984f113e79b---dokawutusuwelij.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0eb2bffd9c9b2166f220bcd00b2c4fa9/47693746734.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/57301632436.pdfIn PDF document text
    • https://avenue102.com/uploads/file/nebijixikefudinirudonow.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_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 11244 bytes
SHA-256: 4fb53a3bbe3e89cd335a622febad3f44af512dea868148cd0839f4e80f4b6980
font_02_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 17496 bytes
SHA-256: 32302770559a5f43cbc316757321d8d1e7e8c05d61e5e0e52782016976f87c75

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