Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17d6fb2d0ae4289…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 15:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e43127baed7e14abb0b5891aacf57ac5 SHA-1: a51d35f3c5b4fac1c91bc8fc6ae3aeac7e4eff6f SHA-256: a17d6fb2d0ae4289c58f145cb3b1d0d4502cdf3b396a16b439193b3aeb054a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The file's structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=4+stages+of+social+movements PDF link annotation
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/65041cf002b610f3a873f8070dc459ef/35561380929.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/zoxanebavelujilamonowifon.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c196fe48a5a---likilemakilarewinupap.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/rixuzifuzujetuzetikix.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/garavajomilixurumo.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202108141247262927.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/sojitarawezedadikivones.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611b283df0690---xinotodosemix.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a647ab46040---30489198680.pdfIn PDF document text
    • https://penal-garazh.ru/files/32159696171.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/zomipi.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/10239654965.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/gevaropusurutixuko.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/rapumanetajumiloxetipa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad63268403---fupifupod.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0bc74f19---26672285521.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210724113725.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/28515706060.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/slmbiqu6a0s7hj1slj15fa450b/lonujuda.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rcjn5tf06ft0s6hhr8d5i6clc3/mepufufinidapudor.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/kugavutobafigaxe.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c864a1815a133b1563544f5fe4edacff/besupimokalifamusa.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/vn9fceetb48gksb933ccmkl0kl/vunosusuvogo.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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 10628 bytes
SHA-256: fcff05758eccc17cbd2cf3a7f68beb8a81c17b59922d53174f2361e359223792
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 17876 bytes
SHA-256: 4664d05eda3b58d253913cf42588361a479edf21f30407a39c1abbe74a70cbd9
font_02_sfnt_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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