Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db5522981529b58…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 20:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15c8efa58930c52ed2d0d6585e7d4e9b SHA-1: 651542dfe80bcea9a1b648a00b1f06f54fb225f2 SHA-256: 2db5522981529b58eac32b519a82063098e42612c02df06176d7f8e7f02b9e00
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b9e0663c4---pesenogeterivugigumone.pdf
    • https://tiklatakip.com/calisma2/files/uploads/rutefupodixotifenen.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160909279e16cb---41174549623.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8aeb488f6c569811c29e96aed9359341/92276584061.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/sorepeb.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608251b9e8c07---nufasodaluxejiw.pdf
    • http://sosnovgeo.ru/userfiles/file/zerugorexusazolemab.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b7a7d16a7---jivavarojogikimed.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42455796f---23883223913.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2aa5ea878793872494ba0b25140b47c3/sodib.pdf
    • http://broadmoor80.com/clients/866172/File/79328489787.pdf
    • http://bellina.pl/userfiles/file/fibeduruduboxapupojokuv.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7ed3d93e---xafaromatolipilu.pdf
    • http://hakkabrothers.com/userfiles/file///66350210630.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d22e84000---18831566701.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096551909f22---1779666347.pdf
    • http://shipsupply.ru/userfiles/files/vidujolikoreru.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b25b4588---37159632389.pdf
    • http://asja-doll.ru/userfiles/file/27219846931.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082163ee6fd8---94820816787.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6ee594a922323da65e2abf8bfe926d9/98554768326.pdf
    • https://davaocarrental.com/images/file/mokajesatedasezumufopoba.pdf
    • https://papiratisk.cz/soubory/wilajuborovosumibi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+anatomy+of+story+read+online
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5abdd6e076a3056e351317f9bfca902e/47625101996.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001037c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 16792 bytes
font_01_sfnt_off00011b93.bin
f0452dac1284e49b99ba7fc64c8776bacb0ecea6f573b57974352a0707e71d8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 10696 bytes
font_02_sfnt_off000133e6.bin
15d52a2332fa51a0ec1903533d02d2e6715cc73c8e848ed0db2e501eca09db32
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E6 17732 bytes