Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf9de03d5ccd4b8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 13:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 365e2e79b84205218b46de234cfbd927 SHA-1: 1ac9e970984a9fab226af4372480f946c6571eb1 SHA-256: cdf9de03d5ccd4b8b0f90e4f4b1fa913e36b5c0f40a18ef103c9e51776beeac7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=antrenmanlarla+matematik+1.+kitap+%C3%A7%C3%B6z%C3%BCmleri+indir+pdf PDF link annotation
    • http://onlineexpert.in/userfiles/file/nuvogabizekevu.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/77536296715.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f921d838db3b035b64fcba79a7db2f48/vevopekuwugafisevu.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/buxovata.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14060745635.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/ferezidavemadomosepikuwo.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-31/20210731141202871775.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/tukusa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/81702566490.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/toverabuvibopigiziru.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///zuxenemufew.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/44e7160d7781880068a9687dac600ccd/47267521491.pdfIn PDF document text
    • https://edgecs.com/documents/1547611830.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/lusalejukinimupojaz.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/48fea4277eb925bc6147ed3c949dac3f/faxutavowegirigorux.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b476909d4---96751153816.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/42e82c6bef7a08e1c6fffb5c2a3f11d6/nazudeposezikugakowerukem.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/81582972292.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/rulumixebomutagunojav.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/05d1d966f1df3262aaf36f1f7160fc02/81597805599.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3cc8bf9b012a89ffa8b8bee267ebacc7/29644827939.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87728860554.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b4f03c1f6a572ecbb2372197cc26950b/senotaditegan.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/65a0aba1b1ca74265850a01abe298cb2/23206990455.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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 17684 bytes
SHA-256: 8065cb50697593bccc02771dbe3c763b51b01913da9a3de94ce9b788c454c3c6
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 11224 bytes
SHA-256: faff65188d17396eca612ec02832abb970fc90172a0c0c90abc1c97fd92fc594
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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