Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f70872257267c0d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 22:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c989193539b2362bf5f908aeb639942b SHA-1: 7139fa8690cd9aa3602badcb2f90ee6dac6dd206 SHA-256: 4f70872257267c0df4bf61ebeb11bd2d48d9093e69c933fcb8372699a2cbb73f
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML_NYX_PDF_MALICIOUS heuristic indicates a strong likelihood of malicious intent, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is used to host a collection of links for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://didopack.com/files/patobogesoganamatopozijo.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b2af47cb38e58cdd8ef23a4495d57c4a/xodajolajarurasiraxakod.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/wukupam.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/bibafa.pdfIn PDF document text
    • http://thaide.org/userfiles/file/76965443389.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8bc7ce9d---7998498182.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf91db1895---morexutitugilokitajipojo.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/surumatapusaf.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/lovunadatikofefeve.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/737a0055c10c235237968ad9a1847a17/56736759513.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/zubeta.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/jegukezetulabediwo.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/34756862203.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/36377523790.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/71156901075.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/57e619ecc7dbceddfe6b87e033d66a62/36858177805.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae35aeb6bb6---kuselezinuvojaxan.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adcc1626f6a---fexavazozeraxolu.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/20121021955.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/talisuwonu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add42c31212---wowudazilufinezi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/32dbc732a22dd2ef2c044e3c40093317/posej.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/jugurinutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tough-minded+leadership+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 18752 bytes
SHA-256: 812e05611d240d70893923feb55f23ad2ee2c6b98292f0bb818a3e72b1bf639e
font_02_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 10944 bytes
SHA-256: bc7cbad7bd6de6e609e2d3d71bf34d0b4b0395dd1cdb98283949c958de4e2741

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