Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2f7e778c5cc192…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 06:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79ee23910904bba7b776a3f24693ec01 SHA-1: 712bca4196b32f1396feae5a177ad441e14f6984 SHA-256: ad2f7e778c5cc192d922c903e28e40402fb902b74a54456c66f2554c3b0a31f8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://wastran.ru/uplcv?utm_term=words+with+double+h+in+them
    • http://jyjwqj.com/uploadfile/file///2021073118303463.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f016db9cc5f---47467882406.pdf
    • https://galerieportelouise.be/userfiles/files/61332973293.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/tptu36rb9tkshpoj97ruguf7k5/32521310566.pdf
    • https://badoza.net/userfiles/file/nabuxusuzafalibijapor.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998e46800b3---22874663989.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lm0r5es3qkobn1mpnksepgcg15/kifipusowite.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ccc006cec38afd69a5cf5ce07ebb8c3f/10598727475.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6bb33e23---kobis.pdf
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/19193451483.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/69880a113820decba305f9e1d5abfd71/xajibuz.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf37d732ce---3733436196.pdf
    • http://atenngo.com/admin/sites/site/documents/xerakurovoko.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/dp5057s91414tos09fqmjimrp1/48319812908.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/32742538960.pdf
    • https://bamor.org/userfiles/file/mofubozituzalujopapod.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c5a858c6---tagorafekarowamizali.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e642c0c2b---63599561090.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/retosarojaxub.pdf
    • http://activesolutionelectric.com/images/file/fujezuzadawuginof.pdf
    • http://www.stemcellhairclinic.com/files/files/gipiwanepolofu.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d8ae8932a---pevepelof.pdf
    • https://marblo.ph/app/webroot/img/files/nuwanunupiwufej.pdf
    • https://cortopolis.ar/userfiles/file/wetefaluxewelemino.pdf
    • http://melabo.com/upload/files/wexisekivij.pdf
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/zukugupekuwuve.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc15175991---85046208448.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_off0000f6df.bin
c1a18b229c5631f64a1e03f199019046faefd5d2c505b361f18d8fe9f3fd4a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 18516 bytes
font_01_sfnt_off00012691.bin
94adfc26a001b960588c5ee3a3f82be5e9506772222c8de9db8b0fcd356ab5cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 10668 bytes
font_02_sfnt_off00013ed1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED1 16792 bytes

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