Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6b5c0a5bab11be…

MALICIOUS

PDF

81.6 KB Created: 2021-08-17 22:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bce91c95287dd2409e4a42bb4bb82d06 SHA-1: 5798b943a258c50442c13335bd9a2af4d6bfbbaf SHA-256: 7e6b5c0a5bab11bed6df56d67de8bedc86901ee72258adb5914477514f36fad7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an intent to redirect users to phishing pages or download further malware. The presence of multiple distinct hosts and UTM parameters in the URLs indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=ejercicios+de+trinomio+de+la+forma+x2%2Bbx%2Bc PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905d14e299---jumupevamo.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/39158948353.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/27443693562.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8397001ad---36783115598.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/38930148797.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-7/20210807145228473731.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f5aa3ba4---wilonawunotid.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/70020560939.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/24156043903.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/95721150110.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wojumejegugilorikufa.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832633ab6b5---22719025288.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/vivopitefabi.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dawijevusebubodola.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/59805236804.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/030557204cd789483367d3e3ffd79620/61557645529.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6d1a710f89b5b70999f220ebba45b076/85126635753.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4233e292e---mawarevexi.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/75108852009.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae7f424d3---3275266613.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6feee5b778b3df19d18a8deb53f28d85/84206742963.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/7a6a6309c66e542c9968fe40b7f73b96/kazinumamotaluwitokipug.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/52990325842.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/dajaximulukibisiraboxam.pdfIn PDF document text
    • 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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 17712 bytes
SHA-256: 9ffde99f7d21991d99287e01b7311f49cbcc45e21458eb589f73eb1fc496dc56
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 11112 bytes
SHA-256: 2bebe3adde2c0c97b077a2efb34b27a604710102980209ddbae840966d79a009

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