Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb0a9f3a0120b72…

MALICIOUS

PDF

79.7 KB Created: 2021-08-19 04:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4aeef7c7b151afe853bbcb434446e8c5 SHA-1: f9a1808e52794de7d6503bc6a91118a08f31a686 SHA-256: edb0a9f3a0120b722c4f05b0eb56ed9763bc9c7994abf3e91b70fff4006382a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160870ab34e3bf---vomigisowuxuvoriremewujer.pdf In PDF document text
    • http://teraval.cz/res/file/77246008639.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/64515284374.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/25017343845.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/penotuna.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fffd7ecf5---zegodaruvenakine.pdfIn PDF document text
    • https://invest.pl/userfiles/file/29696915926.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f486ed93ac---25010108402.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/livobezo.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/vukifotokumarukunut.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a7e96ad0---42787193255.pdfIn PDF document text
    • https://penal-garazh.ru/files/69064008641.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/dufibepopowobitotejudog.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/3067904930.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sinamameva.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/gawudugilizowurimoteja.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/lujobezawib.pdfIn PDF document text
    • http://firegallery.ru/img/upload/67863978529.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6urhn17f4tjcmu5ccl1stc1f94/64381280418.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ce41bd68d726ff0971d208cbd32c65f/tinadakalumanomiluvatasil.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/wawokan.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/litasesipanizelapu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18d1e3f7ee---68984900014.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9d0441dd---geguwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=avengers+infinity+war+2+tamil+dubbed+movie+download+tamilrockersPDF 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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 11520 bytes
SHA-256: 4e8e68cc623c269aff6bdbb615188504d02571ce7d4a8077f65736006782f9b6
font_02_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 17132 bytes
SHA-256: d4aa6bf1c6543c2db11c0c5884bb450515c2a564b31bbd9f7e5617a942e27afd

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