Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7abcd31a85044c…

MALICIOUS

PDF

89.7 KB Created: 2021-07-28 05:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abd337ccb10d97464c07fd54563d458e SHA-1: c8d7a6cf239d00894800e2bfd479c93f02601612 SHA-256: ea7abcd31a85044cd82f3f47fb2fa7aa6c7cb5fd6d760380d65909d4f2582e5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload storage. This structure is indicative of a link farm designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37bc36631---62690533476.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/3092143834.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/warogujuxefaxuvagodur.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/68003524435.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/tofotanipagemujuk.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/70590003825.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3a8882c2---zawufasugopigamolunonesu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/m8bucsjqdl50vavqpfld87fit0/36972527396.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e71d2fd1b1a---sopoviwoturetojasomudu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d357942116---gowuvoseninikowuwujofaraf.pdfIn PDF document text
    • http://coumert.com/images/file/gonekiroxobazeroras.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/vuteripokenide.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/davomi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc2073e76---tebiza.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9e0efafaee3487b5db539409c65d86b/mepumeviw.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160726ae88e172---67752022315.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/tufisisopifiwakoneralix.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085037f313b3---jamopivurumobewirir.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/diwelovapotixiruradema.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/doxepuzivalakejosa.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/figebositewizawef.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/sibubunetenibigi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072dec776de0---wolufagegurasutufexeta.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8cc11553---bogozalepo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3c5e595b988a3de7ba36ebfa52dfca94/82441122750.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/most8m7pq6ab6donkiacs4ceda/70113606708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=five+tibetan+rites+why+21PDF 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_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10592 bytes
SHA-256: 775ee48bb2adfd5fcce57a0a2c7ce87542826a3e7f84e9cad08b025f4f8ebdab
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 17728 bytes
SHA-256: f02acfdd2085f642d398edb649d9853312471899805d1f6e86e3f8b2c77d583f

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