Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0615b9c3e5f89f3…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 08:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90d80e03925af138ed1fce6acd7df639 SHA-1: 57e2871dcebe5b763fca30a36888b026fd022c14 SHA-256: f0615b9c3e5f89f3d46fac8e73bfcf4e1335da81aaeb7a1a65f3b4025f302a40
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and a raw IP address, suggesting an attempt to distribute further malicious content. The presence of external URIs and a link farm on disposable hosting further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ihl0pnc4btmo4iu88aon82qa3g/fibofavabe.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607296cd43faa---mazagoja.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/98437078333.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b1397ad1---85366580713.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613269ac990ab---95394795033.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/39953232956.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161191d7ee382e---gixikiv.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9c2912b0f81abe6c9d412c9814e29b36.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/67093212301.pdfIn PDF document text
    • http://tatennis.ca/clients/29257/File/komad.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/2109546791.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa8a9f2cc---namogubejixifexed.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/46839343585.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210806071042.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tusutifajaju.pdfPDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mgggu3i907e78jcnd0lr747ok7/togupupipuzosukufiz.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/38292344876787a081b5a624eb7badde/vuvonojemanujuzujusav.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/52448505726.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611417a298dd9---18957267936.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfee22b77---jenorogusuja.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/27994217978.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608015877a071---40629408979.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/97547542904.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bftaf26rtlr33hpagrddqqh5ef/63311374635.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/86084990455.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52ffec4a81---54300980548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=oracle+quality+technical+reference+manual+r12PDF 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_off0000cb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 16868 bytes
SHA-256: 3ad309c9fccaac34602eebc90cf1d8dd149b651512876e27082219881bdfcb9d
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10868 bytes
SHA-256: 6e6d197bf8c25fae813728b2ba1897a36d8bd6b94a85b487f449a0018c3a5969
font_02_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1