Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a978e22a74e0c7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-12 06:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2aba42b466c934c81c97a0915c5b584 SHA-1: 32293e7e1065be9f795f14a655881b3b3c289f58 SHA-256: d0a978e22a74e0c70d34d79a0df9a4dd620cd82dc3a8fc68009d47fb8ed566cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely directing users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=ps2+android+game+download PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161310b678fb0b---lelekoxezidodiledumedusa.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/92419711068.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/98504341315.pdfIn PDF document text
    • http://enricobarraco.com/files/peduridasagarawofode.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/sapiwimimo.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/23133092219.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161322dcb7096d---wukakofosi.pdfIn PDF document text
    • http://unibox.lv/files/text/pilaru.pdfIn PDF document text
    • https://yellowstonewildlife.com/39333157214.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/lugekiwulifav.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/48028672796.pdfIn PDF document text
    • http://julianina.dk/upload/file/16175766240.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/zezebafurawijifuluja.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/58554444808.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/16386767871.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tixijowirol.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf7d1cf18---60575703246.pdfIn PDF document text
    • http://modern-pro.ru/files/file/werazewavar.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/zorori.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/55160039349.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/zafamawidenazifobikesu.pdfIn PDF document text
    • https://produse-zilan.ro/files/40658734016.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/41156568105.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137681412a71---wogiw.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_off0000b88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88C 10700 bytes
SHA-256: 78b0e03b7066e0bdad5a5c1ba5a16d458ddb0362c4ce2923d35d3424f7e37abe
font_01_sfnt_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 16320 bytes
SHA-256: 1eee218ecd3c7a78e4212e1f80158bda46e7db938e0176a1230ca09684e77fe8

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