Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf8436418a969e8…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 09:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7ecf0e381eb5cfe2ee4619865d0b967 SHA-1: 33e2c2cc97b2cad8368c21222eb86bb4cac3800d SHA-256: edf8436418a969e8cd11e4c85e01bb7faa1319ff78e84a9296d12785a6bc5e2a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://najlepsze-w-polsce.pl/uploads/93143428686.pdf In PDF document text
    • http://hotararicedo.ro/files/files/4447421427.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kujime.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083acae3afc3---runudorurovipeverurabis.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s4n1j472lg18g2aabg2cc1ekt6/dimofawipijobo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438a904108---20143680013.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/79050528778.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/gipatezikap.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a4a309ff---99283979545.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mtepcnqe1qnceke9496u12b2o5/bagegipepu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5c1c4d89---fetarited.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/af5844fdd6d59ccf5df572aa0fd1aeca/kejajogipaxekixabuju.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160ff563f65cc8---17215247646.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085174c64250---melolipesarowubulerup.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/mipizozoleg.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3e7b5f12438ae2189757f9616c980665/37249287534.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/73045613442.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/76625512839.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/049710bf411ca6ad05e48eb0d6a0fc00/zeriwobalanot.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/gebijupifad.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/19661981785.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/lozojon.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6c1be179e780edd985d4626bdb55ea09/6664758738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=call+of+duty+footsteps+sound+effectPDF 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_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 15544 bytes
SHA-256: c168a3b24a70a8bf2bcea162c4dd0da409b120b211a065cc3641705f5f76bcf7
font_01_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 10668 bytes
SHA-256: 5c46c288607325c7c5012ca50eee29f2d01162a9edbb6d123933d31e30d9675c
font_02_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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