Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed31bc7e4dc4152…

MALICIOUS

PDF

106.4 KB Created: 2021-06-28 12:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b70bc8b5ad7e96d51b9d915438d3b304 SHA-1: 32fb8b07c769f043075c2bd5ada88ac9c0b10939 SHA-256: 5ed31bc7e4dc41520ad450a0e4e2a663513470f1519fe693c497107916b71eff
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites for phishing or malware downloads. The ClamAV detection and ML classifier further support its malicious nature, indicating it's a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=linear+algebra+and+its+applications+3rd+edition+pdf+free+download PDF link annotation
    • http://nicenpos.com/userData/board/file/wolexapelefoto.pdfIn PDF document text
    • https://blugarden.eu/file/likefidopenuwotuwik.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d326011c6---25519622404.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/zariwikevalo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/47d875527d2640895750b19f15617f04/wotewemurelukomafiz.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072016a11078---nojuzu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/63509256803.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b8b3c6a52d2184e32a5413e489bae973/91838333725.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/88036589504.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081311093249---fogudav.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/mijuribanigedugugirixeja.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/62413182851.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/32852406da2485bf65ab10856139327a/kasawedadirele.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b65cea11d---dozebet.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210616_9D468A2D3FA4252A.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4eaa26b571c3342ecf0a46d39bd4ba73/53852075214.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kb2g62b103j04sckaioqh4na40/boxafin.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/t65714mb76jspf6a5p8bkedch4/waduxikojono.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/r86lgm3l5e12474j27h3odf5ol/12556226211.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ca7d3a53---2386501341.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/29a7baf7be64969cc208c320344a8416/dikiseperavonaf.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/xexabamore.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/99561916216.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdacb5930e---sogupawekadekitisurub.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/756ae041d284ad2cbe49c85739ffaf14/74011852970.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cmsrkkd40vuaapr21076isb16i/befijijazarafuliposim.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_off00013d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 16880 bytes
SHA-256: 7178c1151bfe0aec7cce6aab32afda652e11dbd74479426dedf4885ec3e31053
font_01_sfnt_off00016949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18160 11152 bytes
SHA-256: e34f6943209620bb05e2434c8b744bbbdf5099ab2f3fa72989049cd27c8c32ff

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