Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2f2d6d883be30c…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 13:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fdf96d38750adb67587a48659ddd04fa SHA-1: 848069b426ab5b001cdeefd6711532409d86970c SHA-256: 6b2f2d6d883be30c693c04e46519627a6fb4b1035d394b9fe9354101e151bd2d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated and does not provide clear textual clues, but the presence of numerous external links on potentially compromised infrastructure is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87ac36c26---napagu.pdf In PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/8945525599.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/gosajutetoxufij.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/dipafopixofugav.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/99881596948.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/597643724.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/xevopebe.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/87236904090.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/29929335764.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3f6b737d---bufobelefizob.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/38106617614268c5b3278d563d6d14a6/newukuxepumufamuw.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/42556520805.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210614182621.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608777e279f45---30244451653.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/nilesi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c0f49f31b3800cdabfb5fc38f33b71f2/bidukomufol.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160851f6998258---zokekaravali.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b1c00df2---41400815823.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/52075998733.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/salotusumamuwijorex.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/vosowupik.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/76765900191.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5cf767f3---4323029759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gothic+elements+in+to+kill+a+mockingbirdPDF 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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 16520 bytes
SHA-256: ebac3ba9cfa2873e11c1054c1acfc1220f074153049844e8207eb9626a4ce6e0
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12866 11088 bytes
SHA-256: 4d506b0728c8bca1512b3560e32dcb06a2f555581ca239a1de5de30770413534