Malicious PDF — malware analysis report

Static analysis result for SHA-256 91759ed62de138c9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 07:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8bdab465d9c44db22b11f92a6d1d3ab SHA-1: ff25938426148a804a56fa9d4a09e686b633411d SHA-256: 91759ed62de138c911e464a227256e42531d1948d063e2c19d1906c0c457b0ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=call+assistant+premium+apk PDF link annotation
    • http://portableandcool.com/files/files/569911569.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/guwagevanes.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/79816287794.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/80268104194.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/58011054680.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/geduzutofotejokevazal.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wuduwisazivesiveruweku.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/nopovasejosudu.pdfIn PDF document text
    • https://fptica.ru/images/file/88162371714.pdfIn PDF document text
    • http://edituj.cz/res/file/kakivabirekefonaruled.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/gitagerojobepubokexekag.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/rikixibixenelulozisite.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/girudu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/23320568604.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/muwemakodovabegi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328fbe34285---98907745673.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/163c8036ef2919de8e61746cb3ba71d9/97749333075.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/30349971165.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/dozazibagidom.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/44525522885.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/60131953985.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613967a44d470---nodimugodomusevum.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134534b38281---44196915332.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/peboxaximanimagaloxezejo.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/revusigijetezivetipabu.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/jobisapijidimapis.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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 18596 bytes
SHA-256: 2220860a3f3e26a3a89e230711b2d0874373ca9916fd8c6d33fdadd28be99f2a
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 10516 bytes
SHA-256: 347de31437e2d50cc4dcc7cf324ea02fab0c7291b083232c982658a26a9b473d
font_02_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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