Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b844ba9510fdcaa…

MALICIOUS

PDF

89.0 KB Created: 2021-08-17 17:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 525da8d20a7e859942cca817f651fea4 SHA-1: e324e76ed943f40f0a1ebd55ec97fb5f5865a65e SHA-256: 9b844ba9510fdcaac55f356d1b64490e01629b57f20f662ffc2e491ec6c08236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains and compromised WordPress uploads, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a malicious payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://smidgel.ru/uplcv?utm_term=baldur%27s+gate+descent+into+avernus+pdf+download+free
    • http://domario.ru/userfiles/file/87843220830.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0c67c8ab366b8d986bd083bccdce91d7/19071418244.pdf
    • http://inlovehuahin.com/file_media/file_image/file/45733621606.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lddi3vtpjb7f1nhrukm3hrt90n/dopuwewanigafov.pdf
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/ravimofekuvex.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ceef849b5---mijubiseb.pdf
    • http://krevue.cz/UserFiles/File/mexevazezafawiw.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b796de28---16922511506.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/10e686bd19a194c88d87480006798463/50475011037.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/11781134222.pdf
    • https://stbenedikt.ch/userfiles/files/fazanojumofuluxafedafoxes.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bubutem.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/t9cbphvn3563pij1a4lnkgpccq/rapidijarotaxokuv.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd106a99cf---86781584183.pdf
    • http://samocvet.org/foto/ck/files/955608455.pdf
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/81221681548.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/59209327187.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d947a2b84d---88844252956.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a37c9264b2acfaa8cf0e6d702c0bdc31/milevotiton.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cb71db604---vinamunuk.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/35025211418.pdf
    • https://media-get.ru/userfiles/files/56543533701.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608097b7e0897---62310421981.pdf
    • http://mastervin.ru/files/file/62674790482.pdf
    • http://project-st.ru/userfiles/file/36324001477.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_off0000f024.bin
61b6cda2bc37f4d77f24f843c3d693c3378940226ed6531afcf3d07aa209fcea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 18192 bytes
font_01_sfnt_off000120a5.bin
cf095f6ed6a364350c55779eaf2c9fcfd912e06b9338895dc9781a0c1951ce4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 11132 bytes
font_02_sfnt_off00013ab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 16792 bytes