Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38b1a94cbcda788…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 11:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51a63cbc51d6f1182f32adbf6144e2ab SHA-1: 349d8dd6337e9fd4a161d7a7c8cfda802eaa04ed SHA-256: e38b1a94cbcda78865fa48e44df4c65ebbca308b717546c7bc4ce75443745b42
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or further infection vectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 http://caycanh.vn/images/fck/file/99121895622.pdf In PDF document text
    • http://rivucota.com/upload/files/nipegatozajegufad.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/zizateramezusopubuwopar.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/vefofajerisawug.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/92435908706.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/tavagaxuvusejugomaxewagek.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/ganewodototubasutid.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hddu1idode85i73she17se7op6/nezuna.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/61778161564.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711bd1578e---60282944574.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210902_FCD08D89926358B0.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/mawisakejatumiti.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4d9f464fd---xesakixexafovepurel.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/81996108565.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161340d9976749---vixepogetijesesovemuxu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613453e3345ad---kovilazizoz.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/10240123168.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/03c86055b965ce038f28b4120f5485bb/92410733720.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/disurunurenejumakegotozud.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/87149751463.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324162e4ec1---89900484766.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/45928534820.pdfIn PDF document text
    • http://asqcert.net/files/files/zajuxonaxodafovem.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210905002416831.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12cf30cfc---mibafepafewofeg.pdfIn PDF document text
    • https://hoavily.com/uploads/files/lusaladazorupezitelinowul.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/19793068208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=binary+to+hexadecimal+converter+with+stepsPDF link annotation
    • 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_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 17752 bytes
SHA-256: 98fe8bd8cea195046d89c3781790b241f6075123800863b7fbb6d51a413213be
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 11200 bytes
SHA-256: 4be33257cb4bfef8c2dbfaace0d244e5013816a11940ec4e3f84e4506b0ba4e8
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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