Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f0630b9573ffa4…

MALICIOUS

PDF

98.1 KB Created: 2021-07-01 16:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fcf32fb0f2a32ec71d2ba27f3be8738d SHA-1: d370b130c9a49f94d292001907df1a4e2f53e47e SHA-256: 76f0630b9573ffa4711b0f63c9f6b05be49156bcdc1fa77e81f8b7d5837767a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. The primary attack pattern involves luring users to external sites through a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://salon-urody-bellis.pl/images/file/gujanapezawozeto.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ef93edad---39466551475.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bafeeb4afe---59913745464.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/c5aqntt1oplm178pg4aqhrj981/61055639225.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/202ad0deb6e834f6163a153f2b09909a/fapebibozavibewitin.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba2dabc84---38227183665.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/65590304463.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210621224541997.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/db6a0b70b364fbea768a2e5d2680c99c/potitamiradiwifojeki.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/bomudemugijuwedin.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cd41qlfudg3f0tnubasqnr6r52/8234908500.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/934b30226bc4f29fc72a7260a80cc09f/57197352538.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/448e23fb16a61751bfb3e636761117e7/94249746645.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0f24fa6819b65e5935dad76a8a4dab7b/12942411750.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/96176090299.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014c3891c9---58447677223.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878e45547a7---33673630637.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160926abd9bd36---8020356409.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/41271599725.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080848aba6d2---mipudonawavazox.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/abthutj1vv7mokh4h5kk6j8gt4/31540911209.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/40120391446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=football+manager+2020+touchPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 10876 bytes
SHA-256: 89f1e7cd5fdec819710d799b5dde47d8896eeb9d387afdb21155b0f653d37677
font_01_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 28828 bytes
SHA-256: 8e34a7761ca24925072ba86ee04e6749ab867219be8c5f5fb550a917a7c2b4f4
font_02_sfnt_off00014b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16342 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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