Malicious PDF — malware analysis report

Static analysis result for SHA-256 2173fa43da5d8bd4…

MALICIOUS

PDF

74.4 KB Created: 2021-07-10 07:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 320162b8a0f69f047638b57e9f78c392 SHA-1: 507a612fe3ddfacfc127bb69c68a95ade8a8b3b4 SHA-256: 2173fa43da5d8bd4eb57dd7138058339ec28279a6a78e8ff75ae39795a1ac01e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1a9eab2a2ca2922f820a400cd86789f9/18456720614.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/272eaecd95c1508484e665e521fcd988/92085759850.pdf
    • https://circolodelpistone.ch/userfiles/file/wevirusiwu.pdf
    • http://anhbanglaw.com/userfiles/file/21679674641.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4dio8cmscv8c5n533ro7s64pkr/kazopodimemanobed.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4e59d449---60886741968.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c16fb334acaf7459e414d98fd441544b/rurenit.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/a43n0aq0l10k677qva1maeqgch/giwun.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/21134420160.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/74a8ebd71b51062cc028b267fc36826e/verut.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be66cd731---67966168004.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1b77890638e1c8f74cf7be534696184f/bajuxojigujawogusanef.pdf
    • http://aep-tc.com/cache/fck_files/file/6326994533.pdf
    • http://stonebriarranch.com/clients/876969/File/277439966.pdf
    • https://mecaniquekd.ca/upload/file/71296638150.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7cac22177f062f03dfbc0dbafda9a701/59146949973.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075966aafe92---rinogefudakolimexefe.pdf
    • http://agiusfuneraldirectors.com/files/file/39535836428.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/xejuvubuxewalusujujasagu.pdf
    • https://stomatoloska-ordinacija-rijeka.com/files/vizesezilulerugolaluzati.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ec6dc473---fudevabenitapar.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/91e110f1ada3252ebc6b276f9174dfad/tobogagiwus.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19acb09835---jejinamazoxela.pdf
    • https://meganimal.pt/site/upload/file/keledovelukiluvarifo.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vijefisiseforafutapovo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manase+relax+please+book+in+tamil+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_off0000be61.bin
462b0c199e4cf3c82753bcfe237396cc3c093a81ccab3f29e4b90888fefe531b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE61 10984 bytes
font_01_sfnt_off0000d7a2.bin
e46bda08c3e9ea165d1632feeac8326e1fc55a248eda86e96d02e2978f58da52
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 16876 bytes
font_02_sfnt_off000103f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16792 bytes