Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca65f53a33ac181…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 22:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d833f6198db04d065a6331ffd49f0fb8 SHA-1: e27a48fbdd17fa4788cb4ced704ec265984094d3 SHA-256: fca65f53a33ac1812cd0bb83668445a02f3d9b57ecd34e151480a34c797489bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on potentially compromised websites, including WordPress upload storage. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=free+editing+software+for+computer PDF link annotation
    • http://giayviettri.com/img-ftec/files/fanidifupafa.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/80761190315.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wunabosofagazeluwubegowep.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/sugimitorusulim.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/ganivaxobosutejivanipev.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/43527558995.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/51046838005.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/baparuxopajepogemakokuveg.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/99856681798.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/xirebivugepanuwavulov.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/6745601236.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/fugokosa.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/nowosepanu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d3eeefae169f7ed2c4b98dae0575ea88/vovavugudazef.pdfIn PDF document text
    • http://ijfbn.com/editor_up/18351576417.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/19943171450.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430c23320e6---12151990777.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2c43b34a---47036048438.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/bowibijafonugisew.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/20766095641.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/rosojumiduvar.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/nefad.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/febitopel.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/4142064713.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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 16996 bytes
SHA-256: 99981ceb427cd385259291f0bf62838aaa605078a2adc11e328313abaa90d79c
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 11080 bytes
SHA-256: cd7af3728bd7bdd7994fa6169348ef36153380d2754099f904b0fda0d5df9dbe
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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