Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa1e9a8f0b4c27d…

MALICIOUS

PDF

84.1 KB Created: 2021-07-18 03:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aede1dfca63538bc74c973ecb8ac2cd SHA-1: 507160ebf6ebd25e41eeb1f1e1c09bd39ef3f603 SHA-256: bfa1e9a8f0b4c27dbb5140f5d80fa56ba72d73b85a82a128426c32467220c747
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links pointing to external domains, many of which appear to be compromised upload directories, further supports a phishing or malicious content delivery scheme. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://okwmd.com/upload/fckeditor/file/61210268032.pdf
    • https://landatur.com/files/galeria/files/suzozoraji.pdf
    • https://hgb.se/filer/file/mebijamigoxezobonapup.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608d217c22135---21724810097.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301c90f0c7---japupazoror.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2143b3279---37247364563.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a01d1338f68---jazamuwejo.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02be6723b---66929187664.pdf
    • http://auchli-appenzeller.ch/userfiles/files/dolut.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3c3755f3---54370229869.pdf
    • http://iaestedresden.de/userfiles/file/30673937574.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab31d09ad---bepilexozixadatalatos.pdf
    • https://agrilaui.com/userfiles/file/64694515696.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/df41818d80e7d46eae656973d03845ee/winixusuwiwuzebezosiza.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609641ddb4aa3---fetekaxafidiju.pdf
    • http://pk.mo/userfiles/file/zevodumibavuvoxizomu.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bf2e829a---jotuzosedali.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32832895963.pdf
    • http://poltinka.ru/userfiles/file/57613906258.pdf
    • http://4grd.com/cmsimages/file/49826664947.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c748645873---23017288100.pdf
    • http://ytbozhuo.com/upload/file/201704453885.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/giviw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+draw+a+anime+boy+full+body+step+by+step
    • 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_off0000e67a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 16792 bytes
font_01_sfnt_off0000fe91.bin
5d7f5e73319fec7059a210972d79fb702b52dfae7eabbd8c131163770cf47104
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 11092 bytes
font_02_sfnt_off00011830.bin
43a17877c0a361f53bd8fb4ce9c17acc22f891b55db1636d93e1df88e96db66b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 16608 bytes