Malicious PDF — malware analysis report

Static analysis result for SHA-256 70662d18ff7ab12a…

MALICIOUS

PDF

88.3 KB Created: 2021-08-08 08:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b06093a78fe45e43bf308eb33684a834 SHA-1: b174a529fd36f64fbddc0e8faa517f4b64ab1eb1 SHA-256: 70662d18ff7ab12a815fd9788b7e22164ab64f4d030a013847224a524949949b
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file contains numerous links, many hosted on compromised WordPress sites, that likely lead to further malicious content or downloads. The presence of 'utm_term' parameters in some URLs suggests an attempt to leverage SEO poisoning for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://medvor.ru/uplcv?utm_term=adobe+x+pro+free+download+for+windows+10
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160801af5a33f3---11462736454.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f697b78651---93113842398.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e7b1f2d8---20001970326.pdf
    • https://mattress-leader.com/media/84537132758.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5b7a0a90---34302542701.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16a350c27c---19773281382.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d7p791desn74h0i9rc63baf6k0/62558041971.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/f282d9ae6cc8cbacae36fe38ab8c2329/belejawoxevij.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79dc649f77---wamumuje.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/99c379e3be0077132039db4919cff267/duxuna.pdf
    • http://bitite.lv/media/txt/122/file/58240759042.pdf
    • http://bioscipublisher.com/files/upfiles/file/firugorededobepe.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b754c99d8f1---suzupamupozumamiw.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609797a4c1e58---nurugifivisalukuwapukuker.pdf
    • https://paeonia.ch/userfiles/files/20654940174.pdf
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/lalolitatunevemudeli.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4df7da7506565fbfc433b987b72d2429/74494480808.pdf
    • https://kham.vn/userfiles/file/javanuzaluterugodag.pdf
    • http://msinziniering.com/userfiles/file/51612135176.pdf
    • https://mobilityservices.it/file/zalonitikalemulagalawi.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4198b1b31d12158293090b7a2512c2eb/levulisusefukuvidiferepu.pdf
    • http://vizugy.hu/uploads/files/files/vewajogafodimiju.pdf
    • https://tigapilar.com/upload/files/47503340158.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607147812d147---likuraforigeraberagopone.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d3727f3ef453b78cc5422602fc3f1bbc/xuburir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f703.bin
bcffdfc93559fd96d0be6da783c5d2929191eba411e78637411d0e8731bb9e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16544 bytes
font_01_sfnt_off000121ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 16792 bytes
font_02_sfnt_off000139c2.bin
917da5eafc17fe961902c37b4011b31a7bc74402ec961c13ae778636da76ac74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C2 10876 bytes

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