Malicious PDF — malware analysis report

Static analysis result for SHA-256 927184482077fb46…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 01:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22d815300484d5dd2697b7b77f986378 SHA-1: c09f3abbc143a651dabefd31fbb254b44909c6e8 SHA-256: 927184482077fb465ecc47d8a85686b028a6d91a26dd91da89783b294113e6f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=mvly+video+maker+apk PDF link annotation
    • https://rieker-consulting.eu/files/file/54711169090.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/32876047310.pdfIn PDF document text
    • http://manenshop.com/upload/files/jetonumudatudadizirigebo.pdfIn PDF document text
    • http://regmac.net/userfiles/files/38019796873.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/xuzasukoromawebamowagexa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/cv1qpg236u6h1dju4n7er9ner4/77007261141.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/tisividanolem.pdfIn PDF document text
    • http://ruihuitax.com/files/file/tuvimevarewezaxevaxo.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/kesaxavigazebalopu.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/kemume.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/wofelowedabovosezuwi.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/nebaqhkj5o5rli32nhthatu303/83411158678.pdfIn PDF document text
    • https://brakos.it/file/gubutasufavufikog.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/ruroxe.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408149d9952---felakifopavirakove.pdfIn PDF document text
    • https://endobible.com/userfiles/file/73965137248.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/98146104728.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/83402166646.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/xefesamajilolurimexez.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/pibinalodinubogujev.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/26171474458.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fokam.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/kovinovetemol.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/razonunomimuximozalemevaw.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 18532 bytes
SHA-256: 98503a05f8af830bf2b85c909bdae094c19c11dd12ce2fe272d53ecf9c96105c
font_01_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 10448 bytes
SHA-256: 69e61021beee77f5157f49c2ba65b070869cb0928ab5c187dd4128bed0279af0
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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