Malicious PDF — malware analysis report

Static analysis result for SHA-256 13657c5bc13684d7…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 06:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b2eb016a974c781955ae43bdcd958a3 SHA-1: 9930c2232dd8d0ccaccebd0f6d37cbf83cb195ef SHA-256: 13657c5bc13684d705aed4b5f9f6322b626b26997c841e9514b089f0917eda78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://crewmak.ru/uplcv?utm_term=what+does+congruent+angles+mean+in+math
    • http://camonetinternational.com/files/file/17265981311.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210605_35163FE3AC972397.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/3kcahmeo0n4b37uvjn9qjcoo6k/47009726991.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/o3igub85j98fl0vaor00rjh1n0/nilinebawumuzubasa.pdf
    • http://hodori247.com/uploads/files/30789440856.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fc62fc92---sevuzazigibetizatugovew.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/383047cd43df836a54041b4023dfbac7/miler.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/b15950e0d12094dafefaa778a49f324e/19649915676.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3267bb52---sutamotazibexiwezipuzus.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0515e8c1052bea7385d4345c8caf42ca/zewudepibupanuwijifod.pdf
    • http://aitrans.cn/UploadFile/file/F1202106300426016745.pdf
    • http://www.anclupnapoli.it/userfiles/file/kafotefis.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ad9e216bb---nodawategarasuwozojet.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3a1ece8e241ff9b8c9b557a19a5777bf/24999186925.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607459b197f06---53105109892.pdf
    • http://sooclose.eu/upload/File/11695665701.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b471c946707---wupofu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/44d2cdf49da55413d8ae9941f88403dd/20269771339.pdf
    • https://koratspring.com/upload/file/79112639459.pdf
    • https://rosycaffe.com/file/ponuramufotopaligu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o10otro5hdqm95ihrs1ndej665/vofinafelifi.pdf
    • http://myjobcareer.net/userfiles/file/2021062218175273499.pdf
    • http://marcelponjee.nl/ponjeefiles/file/44070546966.pdf
    • http://vivo-mebel.ru/upload/file/88344667197.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ead17d7748f258da8247df5f7f49c19d/22848758248.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3f.bin
34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 16168 bytes
font_01_sfnt_off0000f3d2.bin
aeaafdbfc97e333574efbae72c0ae149b508bd81434339ba2228d3095cd13284
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 17748 bytes
font_02_sfnt_off00012221.bin
ec5f99a6956a9e5b04e86d142e456f6f4eea08a2177da4f9cc73a517c3a4c438
pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10912 bytes
font_03_sfnt_off00013aff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFF 16792 bytes