Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7f4cd27f396efb…

MALICIOUS

PDF

74.7 KB Created: 2021-09-25 09:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3f382eb2bd8ffca46f8bb69b60ce8564 SHA-1: 0a0fb6486480dbc23c7cb4e15ebbfacc314c6257 SHA-256: cd7f4cd27f396efb7afbe9d1adbed1e30656824b204dc0e50656e8653805bc2b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress uploads and disposable domains, suggesting it's designed to lead users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=after+by+anna+todd+read+online PDF link annotation
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/72a65b01dbe2a15d53a34a0d2f9ffee1/49355751160.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/jufusomiroxopekuf.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/62904128429.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139bb30261---16362536628.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/fivapimatena.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210915155224225079.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/jozasubela.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/32208157332.pdfIn PDF document text
    • https://kaimano.it/file/butipakigirewowezu.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/tizexalawiduz.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/90141158773.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9628195962968cb5a53e27d4697eabbb.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ee9807418e6ff1ede0ca40866cdc99e9/zosedewokuz.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/wusukibupazosika.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/tiwinuxiponaniz.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/fizuw.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/xofoke.pdfIn PDF document text
    • http://sakem.org/userfiles/files/matipofulasumet.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/54679951917.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/winaxesuru.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/66707796110.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lijil.pdfIn PDF document text
    • http://finchamauto.com/pics/47509435400.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/63397084165.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/5295821499.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210907160202054.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/dawudugabovikobekuse.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_off0000bcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 10412 bytes
SHA-256: 580f8f5762054eaf24de726a4f38776ba3fe0c3d693fc37f82ff68adbb534310
font_02_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 18808 bytes
SHA-256: 8b68b5189cc2fae4298697facc6cd0b60a5f82491fd1c6ebc89242f282cddaa2

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