Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a82886511de6b17…

MALICIOUS

PDF

89.4 KB Created: 2021-07-03 00:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a35f707285996fc9c1b30ed8ea7843bb SHA-1: 657623e33a7d7908426e384116653fce323d612b SHA-256: 2a82886511de6b17f3c4afafc0e87642f040a4f9b2ca98212d5d6c8136814956
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 a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The malformed stream length heuristic also indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9ac856de906f670846d5f2d5f4240c7/21451306240.pdf In PDF document text
    • http://vantaibactrungnam.vn/upload/files/33459988728.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca69ebb470---zabamev.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/lugemurevuri.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/61242e0f94e9ee0b6c2b7e0e8e3817bd/68316651741.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/sigufaduvuporunuge.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/add56590389da065810a01850039a947/75640481745.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jpi202f5hqv5c6avotqqfit7qv/71513579082.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf77edc3ea---ruwafibexit.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/pizijevenofavilusofebu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73cb846e7---fozuze.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/fogujizirotijifem.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qiutivldc9n162h4l9nac4tuus/vonotix.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/85760147630.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/d02474bbf53fcba2c2b899083b2961f3/repibaxugekukukagi.pdfIn PDF document text
    • https://ka-base.no/images_students/files/76013720017.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ca68e3376ca0eec85d6d00ebca073681/mafolufixujepe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61b05b565f---42743656100.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc3925fbc---kiwedutevozejudigexi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a43e31af---kemazikimuvuxusipunu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/613f1b39b8e969980ca9c3b30c7aa3f7/sajuranatuve.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hbcjadqfkcvk3puauu31r6skj1/8804776661.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/1596208980.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/xukufavisebilifox.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8400d662655a156182030d20335b3fb6/zudevafifefusemif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sims+4+cheat+codes+for+skillsPDF 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_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 10884 bytes
SHA-256: 43b97c347adeae8b60c1a95c96a2e9fea95c9f0c8dd129ea5147f95b0a9b385b
font_01_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 17212 bytes
SHA-256: 5e68662c02228a2d82a1af4c2bc7b45ca2bc762a1de4dacd15c1d8b7f60f6d6b
font_02_sfnt_off00014050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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