Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a3ec53ceab8325…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 01:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1647c7bdefbbab5cd7aa661a4b26ed3a SHA-1: 72ba39e2ac48551f74e76bfc5bdd4c047d6cb7af SHA-256: e5a3ec53ceab83259a053f611e32b3913986e4221ad24a6e25370b403bb7f439
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking embedded links. Multiple heuristics indicate a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=among+us+mod+apk+new+update PDF link annotation
    • http://maudchristan.nl/ckfinder/userfiles/files/45026766234.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/fatetexudekifelegeg.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/jalujud.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/seruwe.pdfIn PDF document text
    • http://3q1p.com/upload/file/210916014249046876xeowhp2hn3c2.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/gumupakale.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ps3t9h0uhsufnst90b8k63lv97/30861638533.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/wexilinuli.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149db63a7818---27055990965.pdfIn PDF document text
    • https://petek.biz/resimler/files/benirosasaxebugor.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e7119b08a5a6840f28cdf263116c6f3d/fokevujemunotolenejowi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5639aa86f---46505627753.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/goligalu.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/sopilawekogi.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/51153758320.pdfIn PDF document text
    • https://pcetravel.com/files/file/rokusaxosuxesorulum.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/jagofefizerav.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/deropakijakijotoji.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/pavarobewopifiduwuveruf.pdfIn PDF document text
    • http://spbi.cz/res/file/wuresajanirujigijuku.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/nariw.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/fuvasiwe.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/28051532878.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/35971061901.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d1ba0185557f437fb4457678553f4ca/42765744134.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/44543249298.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_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 14016 bytes
SHA-256: 820814170a5da203b03f732facc983e5e1229ab7bd7ef216bd86fe8fffd641fd
font_01_sfnt_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 10756 bytes
SHA-256: 2a04d2af7260d12f0820bd9e7ee3609597fcc27f49c4b03ac2f9efbe018a7594
font_02_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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