Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc626bc18510e49c…

MALICIOUS

PDF

90.0 KB Created: 2021-07-06 13:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5783058b51d86f3704a2ea3cee44f017 SHA-1: b9ca726670cf1ad039f049e20acca3bf91fcd0a5 SHA-256: cc626bc18510e49c14a4345dfd44ef8969ce50e222970545d8ecbdd63ca48620
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=what+is+the+connection+between+wavelength+and+frequency PDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/fukokov.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/64371108383.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b05edb8fd8f---lotefebederinodesesu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/11507263599.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0tb2ov88im4mb38lkofb7g5s5/popalok.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210622_170538.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/11/file/20210511_031116_147.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1be5c628---wusedivezivolenefapegoda.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57e54c705---62962366653.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a45c84be---judujibesaxovovo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d084023ff6e---fizutelitelajubedudud.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0d5a8519---gusupid.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/miromaboje.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f807638e7a3c20cb3332f59e3e978f98/44717950823.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/fezajepepuki.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed50f95094---35473351084.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/27837604647.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f8264e0a---tijamuwuvoruwoxov.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed37180b0---fedetibamewomoramarukixo.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66688997076.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/wuzelepuvu.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/34607992372.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/dutogibupuzep.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/53745304006.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea3897ea3---pojejakilukufusevum.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 18068 bytes
SHA-256: fc9484225d90ea6ca94d5da57555f06397537f99cf865044aeb0d50e8f10b632
font_01_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 11400 bytes
SHA-256: e6c9f8c369b556e20b898669779f2746ac110f2415edd99ab570a3edde4e778a
font_02_sfnt_off000141ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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