Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb4ce68d32cc52b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 19:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 52ea4eee42796b898f6e88862cf79bb4 SHA-1: 06140782394c5ef48816045221b6b51dfcdca3e2 SHA-256: cbb4ce68d32cc52b15efc64ce2968e851d6915dbca2037186e5de449af8962d5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/79c8fbfecc2d1c0b0e1a81c748928e0d/wijefadewawusobaxogem.pdf In PDF document text
    • http://goodwill.as/userfiles/file/99545597163.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/misowa.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/lixowobogexewuzek.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/wigawapopapaf.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/51564173173.pdfIn PDF document text
    • http://vo23.ru/upload/file/jamugisodipuvavi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa643eb61---37007162591.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/388b223a3c878c61224f7fae5a52260d/32167896224.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210710_030537.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/miwinevikavetaxoriron.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wowotadalopupibirutugir.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pokobasebejitafojeserikel.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/20641116335.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/54217791851.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9f8932af---65306790236.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/63264359720.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/baguwot.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/voxizemikak.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/zuxafapimarizejene.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/buzopojisaziredi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d641e66cc20---86704404177.pdfIn PDF document text
    • https://steammining.com/userfiles/file/81496457247.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/bedenoxodofizinoxolidago.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/60075020479.pdfIn PDF document text
    • http://getem.pl/files/file/wimemenigorovifuxaziwavov.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/34197620869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+sewing+book+by+alison+smith+pdf+downloadPDF 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_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 17520 bytes
SHA-256: 876b05c70f37fb3b5a106bedba011ff5af296d9a98ebee00028a93f1e8eaa160
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 11240 bytes
SHA-256: b8c3293a98af61fb26918e44d76801826434c8cbc238a9fa6d0ffb1e101f4027
font_02_sfnt_off00012518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1