Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a61bcd76c17756…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 12:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75916b150cd538b22681c4913d63c15b SHA-1: 357f8561741923311aa6a1ed519404c4baae4ab7 SHA-256: 42a61bcd76c177567b359a10a281909f71efb052249ef1c053b31aeb646685e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f4169a20---binewan.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3351f7ed---8074988744.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/pumakuf.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/kobixu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/97f6ac4f99efb95eab5b8981cb585b8c/88936126414.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d4d9facc30531634323ee696d0a6d1a1/vafarumegovobaso.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/82823543468.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/14433010972.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2193f297d---natewunukipokemoja.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/70833415407.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/68675715799.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/67963520410.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/jabujuvirobavegali.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/napawatenen.pdfIn PDF document text
    • https://htchninc.com/d/files/jasovaritenalutikituve.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a288e151750---jetazefa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4817c327f86ecc1983ab4efb0c5bb293/dijixaf.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202153852542284.pdfIn PDF document text
    • http://sam-global.info/files/file/66232960773.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098921308298---jasubesixunemoruz.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/pufop.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738da718d36---diwolokidikesewaje.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ab4c5036463a7aa2305d47aa2986bee6/poputuzugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=instagram+followers+app+for+android+free+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/23421761865.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_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16612 bytes
SHA-256: 85c0d7c1efffc084f367764954492fa11631d8cc868a516ae10932ef620b6fd0
font_02_sfnt_off00013595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13595 10880 bytes
SHA-256: dcb888cb4a48d63c272d1c2ee714b7dbc79093ef3fd8ac2fa52ca80021bf3e35