Malicious PDF — malware analysis report

Static analysis result for SHA-256 a056486354127201…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 19:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec19cea0506c849e1308a74bd05d6bd8 SHA-1: c9a24a99a781f730a39546958a81f1e26acc252f SHA-256: a0564863541272011b755c8fec74b3a4e68e3b5fac1d20d544566677f4ad6634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=webarchive+to+pdf+converter+online+free PDF link annotation
    • http://epoxidice.ro/mm/file/jasore.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8108bc645---18490982886.pdfIn PDF document text
    • https://digireg.cz/upload/74665449926.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/mirepux.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160940583a1533---zizobizazijo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/91826734565.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be1d5834da---fanegukuwop.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/57739029398.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/jujenipirijakad.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972de350c7---sokamukomorozivorozulad.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/15210572340.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/lemetav.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e944eded4---pibugofakutoraxavol.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098fb4280496---feresalazid.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/gifope.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/104c343312e91d64da2e6303d8e32639/76825272359.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/gukuxod.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/37025083786.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/kolojegalupegidur.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608521bb9f20d---gepajupexog.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/selizegezebonudaduvilufag.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/kijezekebisavofatuzer.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/19076719120.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/wemejojusit.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/70937413936.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fc14debf---zifosamuwivovamu.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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 16732 bytes
SHA-256: 450bd91f1ebf72fb2f6c654e3e5dc9eaf7c4618c6c588005f5349b5385c21143
font_01_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 10748 bytes
SHA-256: 0a68cb4eb73d272a679fdc606a90b61aef27142a460fd693f3cb6ac0b9496d41

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