Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad11a863caa4304…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 09:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83e02016c565ed4e2941dff558722513 SHA-1: eef3ff4bf97254d98dbd0b88d7f23b277657384c SHA-256: 0ad11a863caa43047e3aaf20471ad3e1dfa2d95d15653155e2dc491c5a3eaf37
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=apk+day+car+parking PDF link annotation
    • http://metafelix.it/userfiles/files/77753299103.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/bozekeguxasesave.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/16634968026.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4f34414c---zajudanijunexazeduxoguxin.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/44140095989.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107cb98cfb---37697511915.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/lulexajuruvolajate.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e1694e3ed85f40d337cec26d8646889/27770512440.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wanaset.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/63629485668.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/nurakezufavo.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/zonusimeguxowixureduwep.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f093ec86---mowufefemuxinedifata.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e651395aa---redutulagapugeg.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/givawudidaz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe58cf41b---97590402686.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/mopazelivose.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/laxefupuzeb.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210904171154_1981886762.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wufonanazipodakakuz.pdfIn PDF document text
    • http://trieuduong.com/images/Download/75881016519.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/worupisatoviz.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/790hdftahgg21hktn17it762jb/gekurowufowon.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/20424735730.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 16600 bytes
SHA-256: 02d79ade39d8bdbb110a241f776a2b758707257f6c4178ddea0260cf95e9b9f9
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10312 bytes
SHA-256: 37201c07fadae43d25b938daedd936cc9f1405b06deb5314ce4866e64b14934b

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