Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cb9bba859d5c6f…

MALICIOUS

PDF

91.2 KB Created: 2021-08-03 06:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac55f4faa73379bf25a9755dc327e028 SHA-1: f09d35000e9c5397b395bffd71b22c172fbc4ab7 SHA-256: 22cb9bba859d5c6f6ab264f9635ff5d4d350090bf222dab9751594dc31033e18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous external links and the 'download button' heuristic suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bda.ch/ckfinder/userfiles/files/getijifuwekevubavesene.pdf In PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/kizuzitivanogila.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/suketusudutirelo.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/ledegakatal.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/wipixumosidurizudiwa.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/nugele.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/09c80201c07aa30ef9fe0a5390869923/16881269365.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/i9n7gckhobl7thrfk8rmj86kne/39814693935.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/40299856642.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1taettsoo66mfpf98no7a193e6/28745690824.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/76741995941.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/8732001583.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0iij93teit4v6qieh2sn7du0fe/75147592028.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/befovufimarit.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab569a7f3---50021965869.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sokujezalamakuwevete.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17aeed7a1---sejigugaxubixofot.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/88ae961a2947b8ecbecc8c735d0a5ca2/72025996386.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210706_AF1F44F2B794A02A.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/kivegokololo.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/89645231186.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/zakujo.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/bjgbr4tmnglttv7sqvph9do7ge/kipeliginidanepamenesawi.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161089fc47a8c8---38907642635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+get+voice+changer+on+ps4PDF 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_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10996 bytes
SHA-256: 68e1f79bd4265ba5523c666fdaf8a6b0adf5d2b3c4bb5195ff909eb9354c60c5
font_01_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 19900 bytes
SHA-256: 0458f0e4fa314515e7671814ba18684686accc9bb882eaca1f975096777286d3