Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a3e3f313b65c31…

MALICIOUS

PDF

87.7 KB Created: 2021-08-13 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5113e250675ffb8aed00d9ffe393a97 SHA-1: b591202df8546159166c1ea361582530757c52e1 SHA-256: 13a3e3f313b65c3143d20b12a204e7253a7a04478776643111e0e6295f9764f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or redirects users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=video+star+free+by+sites+other+than+youtube PDF link annotation
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ff4cf3ad---28593765176.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/75111559917.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/8302679189.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5fcf6a96c---97998592141.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f858de8dc7---gerujuvemusakuga.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/78966807894.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/59782770547.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/zasatazuloxevitikeza.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/95101245558.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202181715413158.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638b14ff79---soluwibezapefizibed.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/ferisakotopus.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/32192802686.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2c6304bc8---suketubefi.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/49253757578.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/qbvnd9tgadg6d029a5uli3d7pd/zuganegigib.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/35457408556.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0aa4672b738eefb4e7df6c8e7b12ada4/94686168404.pdfIn PDF document text
    • http://elm3rad.com/file/36915387442.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/9352292234.pdfIn PDF document text
    • http://bertolinacare.it/file/22197911810.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/61f6934cdf5dd243c762904edbe7691a/newojodugitaxebe.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/dopusi.pdfIn PDF document text
    • http://vhshf.de/File/magulabunufekewabexi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 17876 bytes
SHA-256: 0ab97d1ed8b2f88726a43d7c115b3545511e6c7ca4ed8b9cd590f41130ad649b
font_02_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 10728 bytes
SHA-256: a4516cf501c243b62e15b6f0953268139047075fe23e420608417edfdc0c07e4
font_03_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 15876 bytes
SHA-256: 724da9445b7ec3b229347d9e5441e512eb361179e158283256c80df40e287a22

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