Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73140bee157ecb5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 08:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f902916e23facf21023c40f6a2c45f2 SHA-1: 31d443043c62079283ae5c2914455c3bc785be26 SHA-256: f73140bee157ecb5305ddab065d92ec26ffb1071f542bc69f0246d62dbf4bfc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=bks+iyengar+yoga+books+pdf+free+download PDF link annotation
    • http://katheran.com/clients/55933/File/18868374487.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/31vj8g5mjlksa88bq97k8u7ch5/18244940739.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/23299438382.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/69495984758.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6b1a5fac86130cf53464381fde58981a/8484493735.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/zafemirinononege.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/86626482973.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/gofipavasabebajejesexaje.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/77938961794.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f77882587739161669d725dc54450fa/27361561399.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/setubejadopakujolopizum.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210613225737.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9ba5174a3a91c4681a1e2241d8036254/87378884036.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/rejufajekuvetamibi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wapisepakokoko.pdfIn PDF document text
    • http://imaginove.eu/data/Files/63493016295.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///nanavakinudewapa.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/sujinufazupubex.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/edh0aia7r1urfea5ud5l61rpo3/78231880784.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bde0f797---gukaxirofitipe.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082667eac0a9---43787139675.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/tunalaxanadiganipijov.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/weriko.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/bemosegozero.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/60891568899.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/69376165492.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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 18116 bytes
SHA-256: f0b24ec91e0208c46dda3ae928938530b44ee00dbbcfe68ca0ea031eaf0d51d3
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 11060 bytes
SHA-256: b16bfde8dbbc0b0152749cf0c4c40a15b6fd6493b257e4822d937649b28f8d11
font_02_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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