Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a53fd59ee10848…

MALICIOUS

PDF

121.0 KB Created: 2021-07-04 22:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f21bb95b79e2aa9e53077cd3ca5dfeea SHA-1: 17db397cd36f804e4fc0b6973996d485ea923ddc SHA-256: 49a53fd59ee108487e47149c734f19b8dda345697566d988a35e2d7621497fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e5ea2c9d4---51649945697.pdf
    • http://fzsvybbs.at/userfiles/file/jomarunedebis.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b690de78592---61983904175.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34ec6acf4---35938932813.pdf
    • http://indel.sk/userfiles/file/ferodojutunegukegiji.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85fd8d044b---pebotarakutokajij.pdf
    • http://architects-desk.com/uploadsfile/50443616493.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098606142512---tafosigunid.pdf
    • http://greenplanetnepal.com/userfiles/file/41008743994.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/3gsuttns6qcu4tvlho876ukrab/fawofupagijalafalixebetad.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6e34d71457b5c5a820c9b67853a9c30b/gajat.pdf
    • http://iehyun.com/editorupload/file/32523463538.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98371aa6d---97992044291.pdf
    • http://gdgom.com/upload/file/210611150052976304rm2lb7gkh9n0.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160928126d1873---pewugapejefabowo.pdf
    • https://abyway.lv/images/ck_images/files/68763924617.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683594fe44---30256818690.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/tesidawebugume.pdf
    • https://hostingyuvasi.com/calisma2/files/uploads/25989858031.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/o6c8lu2c4q4l0ksjojggfqbkkn/10305463022.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/36e353d2561a1f7335ce3a4a310014b7/30606210702.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/36ddbe866362f6a8d702470f7ce5b618/47291812375.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4b578f4a374d9459b830a7dfa6bbdec0/lofetameno.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbcb6e5db5---xikiza.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000557264d---vetofomekox.pdf
    • http://eshop-kocicinadeje.cz/files/file/sukorapekuwapadoxosegow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+add+signature+on+preview+mac
    • 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/
    • 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_off000177b6.bin
7502cc1fed426c429dad89ec48da7f3a91b680255800ebfec159e9039e5b0733
pdf-font-stream PDF embedded font (sfnt) at offset 0x177B6 11052 bytes
font_01_sfnt_off0001914b.bin
4d6275d275fc16c7cd5d15b5b63883a04dc336b4340d422323424ae69400c90f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1914B 18044 bytes
font_02_sfnt_off0001c0f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0F4 16792 bytes