Malicious PDF — malware analysis report

Static analysis result for SHA-256 922e7dec9836f1a0…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 02:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad823847864492f7427c54e902ff5ddd SHA-1: c2170872c4c4d01b5b68e1c01ddf2f7fe38d9c39 SHA-256: 922e7dec9836f1a0d7731f05ee8eeb340d6f465a1ae06f6d5daa1bb183b68df3
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the links and the detection indicate a likely attempt to exploit vulnerabilities or deliver a secondary payload via these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://sitycare.com/FCK-UserFiles/files/dojojo.pdf In PDF document text
    • https://creativitagh.com/pevron/www/img/file/3985622518.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1f3afe7e6ba595cf4edcfa08944b8ca5/89840005867.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/44763748040.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/61049828afb2765afa18adcbb7de67e2/xubezowenegajenulelobex.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/78032654884.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39904f0dc1---60210012525.pdfIn PDF document text
    • http://superpart.com/files/tizigun.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j5v1mbjdk7g7pk75mj976osnqp/17634295868.pdfIn PDF document text
    • http://edgecs.net/documents/saxitexu.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607321e182b40---kutaregaxagelexepavewupez.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uhikokf1ps9gtrdkg81oqidqo7/75374488886.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/22421992333.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607977f9676ec---sifomifopovemebaz.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/womuvokenusojun.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vedazogosemixunakifavekid.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/baf3bf2246c7909e356e2054dc852a23/womirowojidizuvawakifoz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2f285a88f2919f8fc46b197a5477efb3/bajunizozowilidijixo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gnkkarsinj16mtu6ble7ucrsl5/72705649950.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/59d3e3db68c9fbfba20ea795f1bebc92/15596341452.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043428f2698---deroriwejuxapan.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/28923071996.pdfIn PDF document text
    • http://onlinevay.com/upload/files/rofako.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/11830289204.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/nekedunokuwalulemoxivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=general+microbiology+laboratory+pdfPDF 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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 11088 bytes
SHA-256: 232181ca86c36a1ba62d534da30837f3b03a24eff4d7c19dc488ff02d808a9af
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 17952 bytes
SHA-256: d8c447394c84f2c6da61f1921e4f8750561016caa503723ad01cf71836b7f592