Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2bbbed1feb11f0…

MALICIOUS

PDF

86.5 KB Created: 2021-07-09 01:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cb8e0d86b2c998bf1ae6d8adb03c8eb SHA-1: abd2259cd34d2fa15590e210bb03126a35a3c757 SHA-256: cc2bbbed1feb11f01469e05e3c25349480d706a276df81ec96db6b10fd9a8898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a malicious payload. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown-reputation URLs, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=high+key+painting
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9f697ece---10083487287.pdf
    • http://isgsrl.it/images/file/23165864407.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c7d4635ccf65b168d811f25665da284c/75149090539.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2ff0174c2---gubodazonuzusale.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5dfbc02a9---83480355689.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ftr8ni1j178irkkcsuseo28541/kovise.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092523280bd4---mupozisavadoxaji.pdf
    • http://thunderstar.cn/userfiles/file/20210525091433471349343.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91914dd33---34837949276.pdf
    • http://haumeaonline.com/userfiles/file/merozesuxan.pdf
    • http://bajajsports.com/userfiles/file/30042627554.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/juwazusagisonunuxilelire.pdf
    • http://www.huntsvillepr.com/files/files/51244647368.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9g65escf9k6mk1pjf54qvat8o3/66334847517.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/eedda2374d6828048b0303f6fa496200/gexelofulowogogugu.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c48ca9fa---75485329769.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/548e9702d21251fbba7dbd324059db56/95643272068.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/pr0jeu28h3rm0rhv20seojtfn2/493172464.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe852f797---nulajigugizonivuwotejo.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/3fa6af5f5d4bf4f50d459eceef8a565b/52770687543.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ad00f619af6a413b75783a5b62c7abb4/4774918947.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59809a6d4c---91151128959.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e0c01cf3---79143575066.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/77907591315.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16792 bytes
font_01_sfnt_off00010726.bin
0001fc5ac05f889f4bd3ef1981a4d4d952dbac546dd315f1ce6970181fd55f02
pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 17796 bytes
font_02_sfnt_off000135fa.bin
0ba11cce68d6218734431fa3d6acd7825cb3f02a1a03ea03aadbeab7f78cb877
pdf-font-stream PDF embedded font (sfnt) at offset 0x135FA 10292 bytes