Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d91a1681457279…

MALICIOUS

PDF

81.4 KB Created: 2021-08-21 07:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bf2e60f57152293669ce53505330b614 SHA-1: ebfb84df1df6406344965186f88cdfa9250c53c6 SHA-256: 31d91a16814572799bc44726dee36d4ebb26dac011c719bd8f6abee91da5c9e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites, many of which appear to be WordPress installations hosting PDF files. The presence of these links suggests the document is intended to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=level+1+manual+therapy+course+canada PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608be88217fcc---zeses.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/3nvepsfguv9ah2p9c1r7tuk0go/81359426800.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3ctip5va8asb3dogcsvr9ahsab/12362999614.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9nqdqh8v42tke318g38vl862rf/41377129233.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/konerixinemipozimutuvup.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161199c6b5e305---52887998224.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2714d364eb0cb82094483bf9091c1ed3/kojurakolexik.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dumatanirikojifiwamatap.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/90734427207.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/wunajoxewumemotex.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/b26p69t2q6pb0ahgjnbs10p133/kakabowuvi.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/najolefaxudagel.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/9611097478.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050504241554.pdfIn PDF document text
    • http://zae.me/datafiles/file/37060671437.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/95760101951.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/zujaxitikibegaxapokarofe.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021728923549961.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/bevegesomozajabevikaguji.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c56ff46bd2e06d4000471043cc26bd38/31709551176.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/wafusokarot.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4512884113.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/e1ro34l9dvs14alm4n3s1amdm6/renolabediv.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/gaxowikogisibuvudugedevu.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 10976 bytes
SHA-256: 3a60dedbf155220bcabbe9fe125fea1bdd1a3b7aebeeb383bd5b08ca96ee481b
font_02_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 16732 bytes
SHA-256: 3026435a813788408dd064c57ba7a97900910a70d72fbb3b62df806ac72af076