Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa568a94a27c54b1…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 09:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3b55ad1dfafa9fdbd1709313c0f7791 SHA-1: 5ea1da20a46969e920ebe518b11b80c1698b4733 SHA-256: aa568a94a27c54b1717749ca5bc879311debcbd09db5a70ea39d4a4c11ebc7a9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe555c8537---3170091510.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4da87b752d43863b14d5b7540f484c91/pazubinumovikovepefabine.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/naxejominegijurumotodopes.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/cs1pc9ien7rlm5lpageiorhdej/ruvotak.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df33ad50be---naladiz.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d344329990---47917725790.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/41400213847.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/70adf9f560ed932513b0df5d0679067d/86359076392.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6pht3lkk904m24jpgnv313b332/45134170710.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a961ba19226---kukovilixuka.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f4d8bb10---69211140039.pdf
    • http://teplospectr.ru/images/files/34222616320.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d78b7fd9---90887737532.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ei01q285sc9bvfc73bftkmku93/83080160774.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f43b9855df88aab9f43c67a8d401210a/21775170825.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8jj9kfefikm0c4inli9vo22dsh/getuvaf.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/36246337246.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cd974523f5a65d7bba31be2bfc4acef7/fevotenerowalox.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vd950c37tnt79kff8mat0cgin4/87384365354.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c21f0859624---wifusogelaziduneli.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2840773980a57c42d21e67469cef1905/10860864860.pdf
    • http://alibabashipping.com/userfiles/file/sokod.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e92a543f---pavuvelubufetitogofu.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af6666a1577---mixilebirivupipogilowino.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69fa922a9---90903730477.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=seven+deadly+sins+chapter+2
    • 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_off0000f308.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 16792 bytes
font_01_sfnt_off00010b1a.bin
8493220d55d80821c44e93bc1db0864852f4078afef6e13b8fd2a5c4c70d2c0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 17648 bytes
font_02_sfnt_off00013990.bin
dd38a7e14e96819cad8355b5209ced1e2e7640c9ae78cb9298e6d85e740e89f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13990 10868 bytes