Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6772a3d1f2d2b3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 16:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a261c06ce734038de46f627612943807 SHA-1: bc0b676abcb6e164bf12b54b90add8c65378ea2e SHA-256: 6d6772a3d1f2d2b3278a9358735a5d4c10345ccb4ef5603a6cc40aa139b2b6c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, and the document body was unreadable, but the presence of numerous suspicious URLs is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cityface.cz/res/file/3145309840.pdf In PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/78699514180.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/69888629438.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/ladudesobuzunafimeraj.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/74018462832.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/20229032791.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/tunotazuwa.pdfIn PDF document text
    • https://phr4u.com/files/repad.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/58814754136.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613add589388c---94274412613.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/sozinavafagobexinurafoga.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bde4c808c---papazofikuworuk.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/kisupexe.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/buwedivisutopidirivar.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/042c7213105f25f773dbace8965451b2/lezoxakobiwinubipokoso.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nupesa.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/61231812269.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/90856796424.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/25615414187.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210910121146.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210906215513.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/79663316182.pdfIn PDF document text
    • https://buyafranchise.org/files/files/zunozesezamuzaruxijezeje.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/viwexemefenirodanep.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133940974913---fijebojanotaxanis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=4anime+app+apkPDF 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_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 9956 bytes
SHA-256: 2eff456c6c618efb77ceec51f5a7842705b759d00206761d1760cc83717578b8
font_01_sfnt_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 18932 bytes
SHA-256: c1932c99d04fd056128f723d2532285e67271148e11eac15ff239a96926ef49a

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