Malicious PDF — malware analysis report

Static analysis result for SHA-256 93328d76ad370cac…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 20:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26167110e5776bd3b970fc6b3a6a1e51 SHA-1: 1ec89871e18fa6afe1c00a16685962d883be0f14 SHA-256: 93328d76ad370cac48910b4603fa942ba6faeaadfb679875c4f22e94fb0569d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=descargar+juego+crash+bandicoot+para+android+apk+gratis PDF link annotation
    • http://caytrong.vn/Images_upload/files/tulalojiso.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/pegonemago.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/zadoxulaxivadedojekunozu.pdfIn PDF document text
    • http://recviem.ru/img/upload/34426744865.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/pajowabirora.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/baxewomuxar.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/pexukijidibegolexineluk.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/laxefupuzeb.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/92481757044.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/49407004143.pdfIn PDF document text
    • http://acril.ru/ufiles/files/zuxamatozepizamun.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/90709100029.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/14053854859.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7dc254e5eff449445ec4fe7b6098de10/naramivameruwonof.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/tokinumekelewomakenej.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/57740898794.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/3767295988.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/27553f84a70ff67d1772f2e4cf82f9b9/11267955402.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/49257532348.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/fakogotij.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/lugomekininevusiwa.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210918_115550465D869898.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/nirodululedadan.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda17b9d06---35209146126.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/49694590853.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_off0000c0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 11212 bytes
SHA-256: d73ad17e6b1544c45442249ee720ac6d838f9ef5845313377abaac6b362f261f
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16984 bytes
SHA-256: 3de52e6a685f864bc0430500d91d73ab369d96d34c57a53bc83308acee2c839f

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