Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56703f2ac075058…

MALICIOUS

PDF

95.6 KB Created: 2021-07-30 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88682e2b4d04f895549b51bda92b583b SHA-1: 76bc775a86bbd1cbabd261c5a2e124f67ba3512e SHA-256: e56703f2ac07505852c1e67994e59eddc5de69615b629cd0edd266cea53077a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm that directs users to multiple external websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://olimpic.hu/ckfinder/userfiles/files/70556356194.pdf In PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/ic9k8k92vk3125687iq625180v/tifedud.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/masebebuwijala.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd6e00089---didevirajogopevodiwegad.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607866cbc579f---25065380345.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acf2a269160---nenakanajomebix.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/fikunumolovirewon.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/topowunoware.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a224a5d4bc---faroxiwaneso.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/70827083769.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7f5239ac1---47091935655.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/8862770485.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/42478102104.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bc3bdd8be057cb165985c1e2dcc18d7b/mazegamapepanavif.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9872ed9ee---vudisovotakedopube.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/26547566541.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc27e49b45---zigower.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bb66f855---murokafuvezupudem.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/88146988276.pdfIn PDF document text
    • https://yuss.it/file/69134238232.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/32939848604.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/41425647882.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a84b54f72---27315042588.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/48304655552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rust+server+hosting+free+trialPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10704 bytes
SHA-256: e61d6aced150987d6e7186ea41baec347fbfd5f54a88287f356cbbf5d4c64a76
font_01_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 17768 bytes
SHA-256: ff07dbc83f5e57c680a025f7809e1d62aa331956c49b6b40b94219b79393dc25
font_02_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 17316 bytes
SHA-256: eb24179a90e762a1f856711ed860f6151b52055c06e4c61f91618f3cc42302ae
font_03_sfnt_off000157fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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