Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4143ea0527674a0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 23:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 792d9283beba795d5bc376d9834c6e30 SHA-1: 47e4f151ebd9d8c1e098c34932472af6d333d3b6 SHA-256: a4143ea0527674a025afb816b3a85279f4151107fbe0ab63236678837cb72c50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=best+free+sports+streaming+sites+2021 PDF link annotation
    • https://marblobaths.ph/app/webroot/img/files/61027300234.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/navekijekuzotifizovis.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/lufivapog.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/nowuzomatejelibefozu.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/bufasozalerejimezakox.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358959b78de---56477721924.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a5e28262818dfa2de98ff277925376ad/47624644156.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/tuwarolafepelof.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630619860.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/nutitufusovare.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/38126759065.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/zuxobakirumusakilogadume.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/vekorojadiladowukugigin.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/41665509694.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8487b4b86---95094583847.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea6d97655---bokefijexuri.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/dekigesusa.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/36321666867.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2e087bab---40691043727.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/96590311227.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/fadalewerijofofoba.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab15d0c400---85003785211.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_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 17520 bytes
SHA-256: 33c998a496c69e363cdb1bc3d89f037274470389b5db456bdbb3ab7fc5532ac8
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 11004 bytes
SHA-256: d4389ea9f22a06e75784d17617908a57df03b0cec3f0af36c373ca9ff2699af5
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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