Malicious PDF — malware analysis report

Static analysis result for SHA-256 8405a364c912fd93…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 23:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d67d190ccd7dd833760a14f18642e876 SHA-1: 207710ea8a3101ef7922cacebbfd5b9f558c8bfb SHA-256: 8405a364c912fd93b23e409fa9dba2547afd426f99933dc80cdb6be07aae0abf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of a URL with 'utm_term=minecraft+game+apk+mod' indicates a lure to download potentially malicious game-related files. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely leveraging embedded JavaScript to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=minecraft+game+apk+mod PDF link annotation
    • http://ph-easycome.com/userfiles/file/8195257185.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/rusixevunivijikixirafo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ea11e2f---8922921143.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/50414194733.pdfIn PDF document text
    • https://seikai.jp/free_images/files/gominewunivid.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/zodakajobaxavetexa.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/15510222310.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090201115866.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/43659510207.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/18466541399.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16a0106a0---funax.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/57355329845.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/tonutozipul.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/80624726418.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/78813319536.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb28798a41---dadokuroxi.pdfIn PDF document text
    • http://rapet.hu/files/givalulujil.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/52893105282.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/fetilixuzovubapusiluki.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e42bb1fd4e5ff7545ee169b1579e1589/givojumiwokefixedin.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/suruzegamoji.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e083b8febb33769c7018bbfff191a0fa/pifokonumatugaferawog.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/suzuforuz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37114ed9f---34198682953.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/23704240394.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/1176534170.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_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 17180 bytes
SHA-256: 54c705ea285ab93da03029cf2323ac33e1413a58fb99da0ce6334f31d8777493
font_01_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 10832 bytes
SHA-256: a3b702ea61059e85dc5b07d2af7d7327fb0e0ac2552a478c9f4b72b771d7087c