Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb622d62ee360c9…

MALICIOUS

PDF

96.0 KB Created: 2021-08-15 21:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4eeaabacba3a08ba4dd2f017d2b3cd8f SHA-1: 8f8d7312159c699bac47fe424bfaa46834cd0195 SHA-256: feb622d62ee360c94c7338baa3a7c40285935037b249cbc53cb0f1ee54bb7efb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=why+does+my+vape+pen+keep+blinking+green PDF link annotation
    • http://nepodoshlo.kz/ckfinder/userfiles/files/ridajixewax.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4356beacf8ef1e31bf75c234f696215f/vawaguted.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ahof05j22va2dbfk0jrc2lmc8/direkudi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/unh6uljjv4hrfl003b14facjd7/25804251960.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/94427537570.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f0b5c2feb99be018e8c65d04768faa0a/fobinigolodibisiwuzel.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/mamoxide.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/37292790160.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0ded72e3029f8674ecd129137a9cd30/91925661664.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e10e790c9b9be7931ce3af87ecddbabb/88601839318.pdfIn PDF document text
    • http://krzeptowski.pl/file/60449218603.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607897d9d23f5---fefagosixazaderot.pdfIn PDF document text
    • https://protrialse.eu/files/files/72308218736.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6hrsdbu91ag6d09k18ib2uh2b1/30962953338.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16117e97630574---69466840599.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b328d9df944---xoxepozutiloto.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/jobarokewonoduduwobiboga.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/37306107684.pdfIn PDF document text
    • http://apsons.eu/files/file/49645477821.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/gobovepanujudume.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/rovawitokaf.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/lusaloribezenaratufi.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/26655863254.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/21672426319.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2d59e42889979fe9f2be00244f38dc11/rofuguruketizijefagiwud.pdfIn PDF document text
    • 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_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 17580 bytes
SHA-256: b6d4e465d8aae99bde79f6878fdb6157d8f739efcc13b6757e2c8accfd4bc106
font_02_sfnt_off00015835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 11148 bytes
SHA-256: 7ec6f1be3b0776354608420b1b7864fa66694e2c5867287507cb6da20a5b0a22

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