Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4c1905ae28ba51…

MALICIOUS

PDF

91.9 KB Created: 2021-06-25 23:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1955748982662d6898f516b0c9e00bed SHA-1: fa351cdcc0d617e5bed1ed04ce765daf3f9668b4 SHA-256: ea4c1905ae28ba51fa545575f12c4e2d4e4cc6a627237d1ba939c212728508c1
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ankurgroups.com/userfiles/file/73074833289.pdf
    • http://technoculture.cz/admin/upload/file/xejodulunijax.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd2c90be2---37482414205.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v3dibup9aa9777jmht0lmo412b/27723164980.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30401ac6a---durakasiterotinipekewifoj.pdf
    • http://oldtimerclub-thueringerberg.at/images/file/muxakujobabimorazanozid.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed67eb584---18268617385.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a74a9aba1f---17126546485.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/27315f9e28bb8d3f24f566e4d74e39ea/tukupimexalozag.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/228a618a0254d187d2e0723523faf2f3/17689587234.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/83dffcfcda63455520b52f2cb72b109c/40203458485.pdf
    • https://mytopics.it/uploads/file/kotib.pdf
    • http://www.amedna.com/userfiles/files/4233620804.pdf
    • http://kcobafl.org/ckfinder/userfiles/files/zokubolaxubapikub.pdf
    • https://circolodelpistone.ch/userfiles/file/zuzarununebapiv.pdf
    • http://ash-graphy.com/userfiles/file/28168485407.pdf
    • http://magogaralbamoble.com/galeria/files/38559541634.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094729355006---vezuviporanozu.pdf
    • http://metallpress.ru/files/xinelebu.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/kujajifejiwuzaviwagur.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/19e79ce1b1ef2a78631a309753395392/29927986815.pdf
    • https://xistenze.com/files/files/bujuwakalewotaxaliwibuti.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2432cc03f1---matusasefuxalok.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/bc0c138c62651e1775e051f820e9e511/gabadomopo.pdf
    • http://kameleonhastanc.hu/files/file/weninojilas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=risk+assessment+template+excel
    • http://e1pl2.nazwa.pl/busy/fotki/file/42052876152.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_off000103f2.bin
7738a48058aefac377bcfc198da68ce82709344deaa5cde053a7497f501ed203
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 17752 bytes
font_01_sfnt_off0001324d.bin
cf165798db29f843ca4b0b2da054626da480241f4616ce9aefb88bb2aae12291
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 10552 bytes
font_02_sfnt_off00014a5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5A 16792 bytes