Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aab0b34077b3e9…

MALICIOUS

PDF

94.7 KB Created: 2021-07-18 22:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 94a9150b07f4e7c13a5049f16d776d37 SHA-1: 1de87bad8ae562d44419623e229aec1dc0f91e02 SHA-256: c7aab0b34077b3e984754c06424a6318a0353ea962b33ca6e2ee5f1e5cf85b37
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://ucity1967.com/clients/f/f9/f95c10655bf48216a4b8c8e4321ec146/File/15913839440.pdf In PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/77db5f8758ef48f9515f581f3885b304/pepatagakitix.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cbb2d4f41---zamuwizogukowowev.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609513418090c---jekapof.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/kogilolamivesevixaj.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b9eb3865437f9974a2dd39f678c3e798/zugamekalenokelabikuwa.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a1ca24cf26f0d6c1ad8b4ab857120d9a/8818274628.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qs6ud99muecc7qk1ivqddruj3i/12094288159.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/44d4df29c754d941d424f3d153664752/xojirebonaxif.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rl3o1e4b3rholdn6em995satt4/30153893687.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/havq8p1uc1suf6ggs8actsgvi1/setejovobuzufekute.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/49380660284.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/19016468416.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p2mvos1u1m734sg64npuli8dn8/75201563730.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cbefbe0bfd7---vupaxawixusizudir.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/pafibujuj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab93bd600a9---28381001528.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a599a2dfe---zojaguvuxotejav.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608052efe6093---lakowivajavojano.pdfIn PDF document text
    • https://33mobility.net/uploads/files/warafabowemokapet.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/78031677062.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/xalebubafavina.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a99fe5d2f871579f8aa9b3e738161a66/lufusedigisixuwid.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/vr178sb14eu09bkhc3du06bic5/508183222.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/zapebudot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=charter+cable+renoPDF 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_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 10236 bytes
SHA-256: 54a560ebccea70bbad354dc189f753213c7b11cc49a054d6d4a8b8c847e85a92
font_01_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 18020 bytes
SHA-256: c21b06bead3354a3f0bd1a435de0c5c96521976c4afc3287b366d9300c60700a
font_02_sfnt_off000155dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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