Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b9a98ba4533e1c…

MALICIOUS

PDF

83.5 KB Created: 2021-07-17 21:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7dbd5ee5f30550b46672dbead8dd7952 SHA-1: ba1b338b2918bc83b7e1df21c28564150af60e54 SHA-256: f9b9a98ba4533e1c2752bb7f732e7bf47ae514d031f898788151738d7db731e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest malicious content, likely phishing or a downloader. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lalinpress.com/ckfinder/userfiles/files/vilogebofebuzizarerasufij.pdf In PDF document text
    • https://lee-trading.tw/archive/upload/files/japifiral.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9tg0dgc534ip85j3i9j0t9qs96/gizemisimamoladotenamezam.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/bc2db59d67bbeb5811e6372d73942e41/38586093398.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/25156613006.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/pavitilewipukip.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/67d6d97bf6cof9e76s87rdnmu1/46297812033.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f4503e88c98e427a3ebb7ce1f2feccc1/gibunapubanajomumizu.pdfIn PDF document text
    • https://anfauglir.com/images/file/polaj.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd6aad2d2315de8b8cdbddfe654e7243/torojeguzupelejalevutam.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/730aec9928d99a07f722ab33ecf805a4/58869749740.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d427244ace3---34977040774.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/59970224348.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a636755780b---80070961681.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/nolupetutixosazosod.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/vanigukijeni.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28007352522.pdfIn PDF document text
    • http://stylekd.ru/files/mufevarojanaxo.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/kenamikokodivo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8f1f05d9---gaxuxutifetosonara.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/32707937711.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/73127238833.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/086a726ecdbadbad99f218a32397301f/46887068036.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/laxavixalevodob.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xojenavi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a02b27c0---85739605208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pc+bus+games+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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 16172 bytes
SHA-256: c150a3150c243c63c7a03c3e8669fdd026933e4a5aefb2f8f59c96c59ddfdfb9
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 10752 bytes
SHA-256: 052c8eaad9b92632b3b34eae2320bb97de1682fc2a15f96eba9130f5fe2baf22