Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4aad753875243e…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 08:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 16f374083b5f54e069c5f8e34ca1fe3a SHA-1: f3396caae0c43d514b25ccb73db313082cfd2c5c SHA-256: 1c4aad753875243e14c52ab5b92a918fe524383e25862f28181607eb6f86b087
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress uploads or disposable domains, indicating a likely phishing or spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to distributing further malicious content or leading users to phishing sites. No scripts were extracted, but the extensive link farm is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=dense+phase+pneumatic+conveying+system+ppt PDF link annotation
    • http://jrpst.pl/userfiles/file/49214705671.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb867aee08---gunazabe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/653c78ade2d1fd351f366f925224d266/41325693022.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/83334237515.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2e3fcd1fbe415e3e51d4f3f1ff10338c/sibagoxovamu.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f87ace59---30887872074.pdfIn PDF document text
    • https://shibbirs.com/media/files/45401947482.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd554a9f0---lidutudumadap.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b6fd559f---ramikidujusipijena.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/zabufajopibage.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a61e935fa---37110839275.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072889c63576---18429898885.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6f83d919---regirewefug.pdfIn PDF document text
    • https://bursac.net/userfiles/file/sefotojivirowatevupot.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47ca63076---17860078193.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dddf3e4584---ruzumuvikadoke.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11698140328.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5dgkag88uqvm6jn5b9hginipoo/27923073193.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/nexazegizofigasaju.pdfPDF link annotation
    • http://vantaidongsaigon.com/uploads/files/59962309373.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/95ade6ec97862ac550c9368a10c3b441/54119999279.pdfIn PDF document text
    • https://area5srl.it/file/55950380573.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43fd5ee5b---74727291157.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da4824f8b---404384896.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013681.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13681 17184 bytes
SHA-256: a65e96bd71e8109a09e273c65c8c4e62b22e4e30c6df2b4894dd6db79b851eac
font_00_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 10956 bytes
SHA-256: e72d3c98e15dfcf4280f957e9f5ab35f6dbc50715fbefb0182108d4acce4be72
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 3052 bytes
SHA-256: ae0d09f3c06cb8ff90f012bd7d121c844ccebfba9451428dfba18d6337f5d527
font_02_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 20576 bytes
SHA-256: 6cbe602a89347508ae25119c3122408a20124d37144c145615e608b02e01ff90
font_03_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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