Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bb208ea380e8c2…

MALICIOUS

PDF

85.7 KB Created: 2021-07-09 23:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25c8b018cc72fca55158c5bab5ed248b SHA-1: 99f26b3ec0182f8ebc87341aefd64ff13358d763 SHA-256: c7bb208ea380e8c23b36189a9b2350617da5ad359ddb71a6bd225837c92fed7d
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links pointing to compromised WordPress installations, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc74a3363---xixurumikedavepodetu.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2807b7db304cb35bd71b4637c98b7540/53252283449.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/44045ec0e86e000f7b971fec788273d9/16638301800.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/mojajikigogapakalisexe.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacb4b611a0---mulenariluvonof.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/28874260287171393ac03a17d05bdb93/zenazifuzukopu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac45f93f45c---46249819710.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/11378139788.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/41763097078.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/obevp02qmenb3bprir1okq0agf/pepavukipif.pdfIn PDF document text
    • http://ropesadventure.com/d/files/kumuzoj.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738848035b2---jutopagafebipovomo.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad909e63b---rowijadugiwumewevi.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/89185954175.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c83da3fb---73252033379.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607473cbd280e---53253350712.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c1ea2740---buvimazodepuvifadizariki.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/vuzugunotalidaxijomem.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808aabd6412---zujuverikufuzekametitav.pdfPDF link annotation
    • https://majubesar.info/contents//files/79421310900.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c490e2e76d8---44659409758.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zodubekasori.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fovafilezanunidijugetot.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/21892742795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=giving+offering+scripturesPDF 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_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10652 bytes
SHA-256: e793b5144fe1ea4bc4b983326220e779784d10a4c5108d86c7dd96893e87d034
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 16916 bytes
SHA-256: c5372389f0ad66b37a7b108d0de4bfd9fd0e4c70ad378f6463cb6795fb1174dc