Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c1d9c02f96070c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 03:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3aba4bcc2b2d4f6ab69db3fd82c0233b SHA-1: 25892a0eeb2d28a0c01c4197f2f5ddbc43911f38 SHA-256: f8c1d9c02f96070c9af31c3d9f78d790c1cfb1f31ca38ec5268edd5a873ecbfa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the malicious redirection via URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/17234039701.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fca30697e---67705958162.pdfIn PDF document text
    • http://sbairs.com/datas/files/63873929923.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/5152352447.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/72405968178.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/2591264740.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/jujinunifafutikipe.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/12155671363.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73557910025.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/supirasen.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/18851474368.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/40643399885.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/14374055813.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/37922790934.pdfIn PDF document text
    • http://artio.pl/files/files/lomexedab.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/80f3f9b88f5a06e29eeb38c2d554961c/tonanunasatolimuzomip.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139542f468c3---tusalol.pdfIn PDF document text
    • http://stefani.cz/fck/file/tobogonirajisotezal.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/91200760283.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/jilovibawukotipi.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/numolasegopuzozasakadixak.pdfIn PDF document text
    • https://mollis.rs/files/56754045376.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/6248751075.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/rojisajijenox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+cut+video+in+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10640 bytes
SHA-256: f271c144d218fd74fab0e04f7c48b402a70893eaa6e7e2fc90db3edc2e3c4c87
font_02_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 17620 bytes
SHA-256: 37dbe7a88905736ac384c70b7b302f75bf66b547805942fa930ddb42173a6493