Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa26522bf131dbea…

MALICIOUS

PDF

88.7 KB Created: 2021-07-16 16:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2201d2fb47b1ee15a2659f3f52111f1 SHA-1: ecb2b3786ff54c725bc64e6aadc766971e64bd38 SHA-256: aa26522bf131dbeae32e38fcf88813b13129ac4f615345e2681622eadca17b93
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many embedded URLs pointing to various domains, some of which appear to be compromised WordPress installations. The presence of numerous links, including those with UTM parameters, suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/db2ec3f849f88ae131ecd84249ccf9ec/90757360199.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/614300f1fefcccba26ebf81aa3fb6323/47452463869.pdf
    • http://tandartsindex.nl/images/uploads/salopumegudopebadas.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/gnkfha40nnk1dse3tej87o6tb6/17571054416.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/98514c0f6d578d286ffa667eb67b8f8d/tanufujuditesa.pdf
    • http://wib24-admin.de/uploads/file/xefevetake.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/rigajidubiri.pdf
    • https://yingzhaoliuart.com/upload/file/21839773249.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d561e3cd---70440738170.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1kghcgqqab3s8v8cje2e8vba7/96195916291.pdf
    • https://studiorampinelli.com/file/kenerowolepininorusa.pdf
    • http://annandale1963.com/clients/69704/File/wiluvunuzumimuvas.pdf
    • http://www.celso.org/download/32441553993.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bb6fd9343d5ca307f955b3bae1afb7e7/88603296914.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2b14cba1---titiv.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f06d8bd921---sovonojogovumawunit.pdf
    • http://ubest.ru/images/file/netalogalalosobisi.pdf
    • https://agrilaui.com/userfiles/file/womujopa.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f3ceb09d---64840873439.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fq636hdgs1lgleqi239lvujprv/74008465442.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d555c3d7---10469308279.pdf
    • http://camonetinternational.com/files/file/databadodafepexovozijutu.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jbf1q5t661hko2hfnv233sihmp/tuxax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=as+it+is+in+spanish
    • 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_off0000f89f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 16792 bytes
font_01_sfnt_off000110b1.bin
27814f3f15222402f1d9fe62ee6e82cbcdb5d11e9c1d3b40e699d556e47e4109
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 18256 bytes
font_02_sfnt_off00013ff3.bin
e25a5371604737e542bc298e7224d6f2c382e62b9a4d9b4510a0a18bbf7bb508
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 9932 bytes