Malicious PDF — malware analysis report

Static analysis result for SHA-256 313d20971d1f0c60…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 23:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37c243cb670150c52f100d780614c68d SHA-1: 126f43cf2c8d8bda193c5b09607d7e99bb33084d SHA-256: 313d20971d1f0c6069a55fcf056989a6b7d9bf9dede12ceb53675382257dc0e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=poke+genie+pro+apk PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/daputizidej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dfaca89f7---pepobebatunibedej.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/48659123968.pdfIn PDF document text
    • http://p-energo.ru/content/file/39086166967.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/489328095.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/vuxixeb.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/vepisosiruboxijofitimi.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/38691606975.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/21134956296.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/4272351519.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/jifirite.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331a2a2a68c---sagadisivedewuvo.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210910002915.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/41845702629.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/nibiboxazalo.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/83169381071.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/91015543568.pdfIn PDF document text
    • http://scarpatti.com/files/mutojanunuf.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161329c874fb3e---kanekejumeg.pdfIn PDF document text
    • http://japhina.com/upload/file/zajolukoligefedimuravet.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/22803783895.pdfIn PDF document text
    • http://mobiliteit.nu/files/91088404905.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/2047791913.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/nugipelawifereleriwit.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/jetasijamotuzizosowegeris.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_off0000bfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA8 17416 bytes
SHA-256: b64db9de0e587597a2ef9063dda059edaac3c259f35c2c8fb730f60ed4ce922b
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 10208 bytes
SHA-256: b8795cfc16df90d8b1a0a500236b370927c240bde9858fd0bec00ec31a9583f4
font_02_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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