Malicious PDF — malware analysis report

Static analysis result for SHA-256 c500df9a5abfafd1…

MALICIOUS

PDF

85.5 KB Created: 2021-07-04 06:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3defe522772329437517d563377431c9 SHA-1: db4e9723b7ba081768efe3100129a6d90c1eb2a4 SHA-256: c500df9a5abfafd195869bb839f05938da1d72c5bc7b6e3c50eee029a40a64e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, likely intended to redirect the user to phishing or malware hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ketchas.ru/uplcv?utm_term=send+notes+from+iphone+to+android
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a4a168f8e---jasonobazaxiwizejizamolud.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e0462400c42ef66ba066c4557f5a3154/zutatijotuz.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adaab00b0a6---31079750924.pdf
    • http://csc028.com/userfiles/file/20210607222505_lmpzoe.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ece3a97964107c432393d64237355485/zuvowumugewivi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083928f6950d---63224200817.pdf
    • https://bczenekar.hu/files/file/99411203540.pdf
    • http://fairmonteast1969.com/clients/876766/File/27548797882.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61e510f3c---jupuwopum.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16092362f52287---60435701693.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607795117abfc---77570794226.pdf
    • http://bvsaigonbinhduong.vn/uploads/files/43999637132.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc51048f0---zuwavabajupus.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bfedd261d18a762f68ce433cbea2d6f0/12457917744.pdf
    • https://mecaniquekd.ca/upload/file/jekekupo.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607975e63513d---jedorub.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e8df14ed7---kugofe.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7087df62dd63e87ef8f1e05fa1bfd945/zedaropimunijaf.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/97425425871.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/vanumonu.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/35611894739.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1o6lr6mm81b88502ecqpuvhs17/92655598583.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e36530a0---gizawigemedudemulevegose.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085217d45ae0---xawumubini.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_off0000ec51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16792 bytes
font_01_sfnt_off00010468.bin
97ee5f60bd264b07e61cf60b1d75b08c5fb522dd56acc973981c6d990a6bb772
pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 10792 bytes
font_02_sfnt_off00011d0a.bin
dbe2eff7edb556c137186b827a8095d2f740c9cec2e67b7a5e4d979b4556b2f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 16828 bytes