Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a06fe7edfe55086…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 11:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c27da5b72981f3b6b3b300d2cbf4aca SHA-1: ba2e6560cc9347dd0f075212fd85ce087a8a2db2 SHA-256: 2a06fe7edfe5508691f923826687eb337375c2d9bcb63eff1c24e3385f29e4b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or link-farming operation. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary function is to redirect users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=how+to+write+an+undergraduate+project+pdf PDF link annotation
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/62eed1491941e32307e736c65cb99817/89406063887.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/78581148932.pdfIn PDF document text
    • http://halmar.info/userfiles/file/nolafepudez.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bm3ovlatlot88cqlji9h3ufnb9/kogeluzononot.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a68390a8c9a---71657193112.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/14899240723.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3guuqebl6j8bdtho8u2bpfch55/71906775575.pdfIn PDF document text
    • http://dalaichau.com/files/54985699213.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4534ae168---xedediluroperirarapi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10830d2c2---wutobesolizexew.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/tarupexodobumeriroka.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4588e2c629e1c49bdc4acbed4a034f9e/18139938327.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vewufezovog.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/7468648420.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f27dfe91e8a078f4567d80ebd1112a93/22875756.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/vavoson.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3f7383ae84c93632acf89ec5180622f0/naparo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d678636d---bosopulosabivizoruj.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/13ad4bfb154897c7b55031fa83d5de00/fakagifugidasote.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4c3f5998af71465a4c8da81e4b33d14c/56057894803.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9f814907---72401815629.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2fa4b38c2542be5fe1d5e49aa80d8620/mejovasoxamodisefifu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cpf9r6urtcp2q5b97l1ipv87c4/74244648229.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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 10888 bytes
SHA-256: 7bcea305a421d576027d019722031a7b03665c646e8755b9d64433427db9c067
font_01_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 16904 bytes
SHA-256: fe1c3ffd355c5bafbe067d44c416196f9135965dacf15d4555a1119738f97a5c

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