Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c22789ca48a708…

MALICIOUS

PDF

85.0 KB Created: 2021-07-14 07:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aa4006048e42c72fd86a489c1e82262 SHA-1: 155839c1b17b73c4265e56954ee11c27a7725cca SHA-256: c4c22789ca48a70812c3f0688a68f33c3f135d8b79a7b3e10bd07ec5b08e8686
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=how+to+wash+your+face+with+a+nose+piercing
    • http://kojeneckezbozi.eu/userfiles/file/35764064718.pdf
    • http://metaglas.kr/userData/board/file/jaragidipiponorilemepeji.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607da6fca6c10---74997604377.pdf
    • http://esipro.fr/userfiles/file/galowomu.pdf
    • http://gerocuki.hu/user/file/81146680856.pdf
    • http://alpha-th.com/userfiles/file/61466133035.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/24e2bde49d4a9e26e9600b421a97f109/44152010753.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac528b54217---damunufewuf.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e58a5ac3---genepasezibodoxodixupofex.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607255e9e6980---83199638439.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160df114f1578a---xudoxifezudinijafavewe.pdf
    • http://steakclubhn.com/campannas/file/bosusevubupuguxo.pdf
    • http://studiopignotti.it/userfiles/files/tufubozatuvetavu.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jumitawijebobipuzo.pdf
    • https://alice-immo.com/userfiles/file/xitozarad.pdf
    • https://call-life.com/ckfinder/userfiles/files/popobegagulupevuf.pdf
    • http://ecohort.com/userfiles/files/44550570756.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/gimm6dl5136hivcifsqqbh44i3/88108961365.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab55a00c576---redexuxiz.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1ea815f0---44712109738.pdf
    • https://gbagencement.fr/uploads/file/86531255311.pdf
    • https://aimara-bg.com/userfiles/file/fugefulijum.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b28b65b8---23642154740.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3ah3f84dbc593ma26l9op19ujr/53511842333.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_off0000e9e9.bin
558b1aad69385ff41d7c1b098f1fcd76dbe2e54444cd0df4d51c0b8c44510fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 16624 bytes
font_01_sfnt_off000114e7.bin
561592ce88ee989a6eacc417352e13b57dbef0a1aaa0c891e4c8ae255bda9a76
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 11004 bytes
font_02_sfnt_off00012e88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 16792 bytes