Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34a824fed1850ad…

MALICIOUS

PDF

87.6 KB Created: 2021-07-20 18:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 123f2957633c6865de22612d566ea9d9 SHA-1: 2e7d2cde41169a2bbc097847f9986a1ab65e9be5 SHA-256: a34a824fed1850ad1038b68b57deddded9fca9bff68196d7188aa887d4ad1040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69294e86b---57788973386.pdf In PDF document text
    • http://strahovka66.ru/userfiles/file/gegop.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0091904a---22375362919.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/wevaki.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/puwugawi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2685225ad0---namitogozebowel.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a937ca4b---xixowozogago.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce19a9f92d---14609954599.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/vawewuxewebifajuvezus.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f3c9bf53ca8b12f5678539a604054f3d/95202307884.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/10008773941.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cec7e6665840a9aec6ebf0bead0768dd/dulefunimibufigifer.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/37d1aa51628771331f9d8772f4d5cdf6/20044061178.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/lunurajininulaboledaraku.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/95107873923.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-18/20210518063522553842.pdfIn PDF document text
    • https://cristalensi.com/public/File/vevejuzeniwejifobutipomu.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/gusujifomaj.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/76a730b86979e9d20f1b778a70d45cd6/livalesijisewivef.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/18990364779.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/28835741625.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ls77oh150kbhm9ht949tdm1fgb/wuwupevelufape.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e6009456204---81949792155.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e482fca2---dupus.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609359d940858---84823969619.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/69391513732.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/21557904717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=norethindrone+and+endometriosisPDF 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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 16348 bytes
SHA-256: 8697755e2ac226a4b0b9cd81ab6a62a8f266801c127abfbdbd06adfc3fe71af6
font_01_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 10444 bytes
SHA-256: be7175380f7d5c31746a298b7100f98896962f8f6b9ab6145a6e07f1c062e9af
font_02_sfnt_off00013917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1