Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc4c66eaea3854e…

MALICIOUS

PDF

107.1 KB Created: 2021-07-15 17:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f4e4f6fa5c58541cae632659075337b SHA-1: ca6ed6297bdc73d47e479e8fe78bf00062c3bbbb SHA-256: 7cc4c66eaea3854e29f7d1f4cd850d0a3c42a851f184731141f714038da3225c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination, likely a phishing page or malware download server. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://philabc.ru/uplcv?utm_term=the+witcher+3+bard PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608054c395a8e---5996568811.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/43294260535.pdfIn PDF document text
    • https://viettrungson.com/media//Files/sopaga.pdfIn PDF document text
    • http://ausafe.net/images/art/files/nulijixu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af92398ed0---xujipivijibos.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609837e85d507---57269893284.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/rojit.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/puzanutun.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607971ba69948---powulavuga.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607514f487483---jinuwunefolegidozofagoji.pdfIn PDF document text
    • https://dintek.eu/uploads/file/61700543639.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/gakik.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74719980066.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d26d9ea78fa26d250a9381ba495d9b5b/xulewipugatugikide.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a9d494ce---mozimeregata.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/achkm15sna3u5k79gg1jhi5nb5/79524355746.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nizowe.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/22739456108.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26c44577d6---lekuvuturesonopo.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/24681309742.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/41078870217.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 10392 bytes
SHA-256: b4c43bdd9fa4c5cd4b851b47f8b74eee1bbab3d0c8d0625dcc261799b74ab41e
font_01_sfnt_off00014385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14385 24440 bytes
SHA-256: 42e0f8ddee81a8f927c09cd72a8d23e01fd7f0ef863dbfd576c34486afede4ad
font_02_sfnt_off00017f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F62 1660 bytes
SHA-256: 34d899b9f9c8ea0b523fc0886b696d6f55cd3a83312b2ac1290801ec1505b895
font_03_sfnt_off00018747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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