Malicious PDF — malware analysis report

Static analysis result for SHA-256 871e0d349ea7bce6…

MALICIOUS

PDF

89.7 KB Created: 2021-08-06 18:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ce96da48d1843b175ce2603c765be72 SHA-1: 2b3557e284bce9eb05e98ee1ba56deac349890a4 SHA-256: 871e0d349ea7bce6941d95233d9ac2aca655a364811c8596b8aade47a7bf3d47
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=how+to+see+how+much+my+beanie+babies+are+worth PDF link annotation
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918873ce03---fexazubusufak.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/69fe7f31e9248ee02e4a8706ff5ccfac/32544395082.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/78855715193.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a6176152ba8370af0124a6824165c710/kopiperunilenid.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/tenofevuted.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/simixunaperoreletebofa.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-16/20210516032722341319.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lig50o2unhb7gho3etkap3pks5/mipotalixes.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cbf30a90a35a71f6e90e48f87d626cdd/zivavijevavatijal.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/65917924325.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/losenetexu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/26n5dbam3umd738qo8md2bderp/44600360935.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/botalovajoxevajelukoxesu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d8411c1b---dinuxatenenakudumavap.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/86230575690.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/juxofoniret.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/miripa.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eb124778ca65984d0beeab28f27351ac/lujewo.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/cd089f2952b99c58dc585c909e9d5a3a/berovaxarudexumifiziwi.pdfIn PDF document text
    • https://bio86.net/fichiers/zovevena.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/gchnuacj5g9nr5u11o6l27u3n4/bivelemamuxiruxavag.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160952390c237f---fukobukoxusisakujezamo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kun3g2aeh34k61ojjjg6hlupa0/22005984331.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/42f05cf098c5af9441553f65fce11cd7/womazefujigafe.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_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 10880 bytes
SHA-256: 1a9a6d09df0f3221834a18b5b6ca9919f322b42296b74d012180f473e0755069
font_02_sfnt_off00012cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 16652 bytes
SHA-256: 98edab070768b2f3795bec376dc143354e53c3c7ebfb8f604b1592f4f1ec8486