Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15c0ca7f73e32af…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 03:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40bc58b432c131a21dede9f3708d19ec SHA-1: 46b88fa5386b33644861d8dd418071d97df55bee SHA-256: e15c0ca7f73e32af53effeaba7e134305c72c2b686e223280215fc08c1ed5608
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to deliver a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=unix+shell+scripting+questions+and+answers PDF link annotation
    • http://hi-techfiber.com/userfiles/file/47665683869.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/24230603168.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e3ss2fnge7acbs2f2ibpv49ja4/xekidopupuwifirebal.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/90050818793.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4bad2ac0449182193dcd784b9e660a4f/likawetikotaxe.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jbti1gk6d9eu7t5c8q2vi6vql0/turawalonupub.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///9177109819.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/dadum.pdfIn PDF document text
    • http://sciattella.net/images/file/lezuwurudobo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d21eb8ad3c8---75048268484.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/sitaxedosijajiw.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9706a45cc---sutofoluxataset.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c7691254---mumusepenepusumakixiso.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/72821044061.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/wotitajedenowemigeb.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/wewixaxelozukebamibe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b154a3e62f---50198415027.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c1548b398635a8312e90687f40f4bafa/mafedomuwunakiv.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/80111939740.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6ff85fd33444a600081b532a69d168f9/87016933278.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qcgc5a3gldif7fosh6j4dkhpb8/93907653053.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/5e1552935e5b9d8695dec3276060f16b/rumepe.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/36864896101.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bc2404fe2---tijoxuwujo.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/23316927493.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_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 19080 bytes
SHA-256: 8e5a7d6f1ffd9ef62dbfec65cd5034f035fb76ae1e3b5656375b5dc80441372c
font_01_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 11232 bytes
SHA-256: 247d9c58748b1cc63f74ad3f3378a4a1bf8db65a11e75610532160952cc0d238
font_02_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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