Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef2268233b8f038…

MALICIOUS

PDF

87.4 KB Created: 2021-07-21 12:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 742b7c6a7eedc282ba201ca7ae528126 SHA-1: 1eb5223131ce801036c762b990b6110ecf78246d SHA-256: 5ef2268233b8f0383270e67bd38ab86394a64247bd4f9471809f56b8c1ed1709
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest the primary purpose is to host and distribute links to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://patc.fr/imagesfile/xidiguk.pdf In PDF document text
    • http://mav-auto.ru/images/file/pilugizasedom.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210526035220_8cv2y4.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/7063809267.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b5d90851---24626761538.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6db02ce9---bovikotemetogabebejo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d3456491357224408633b59b2b465d1c/xotisexeraned.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vunaritaluduwikad.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/4d34c7d2cf6d5f4b7420d748618b4a92/zijegefaxem.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/magamafudipawafedepiwej.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/99018968468.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8e0e1312cc4457fac76e2d8d2abbdbb0/75134883476.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb53c28bf49---sipilubusojixadowa.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d4d701bf---tirodita.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/40d6de877a7b949c0c64d60929d1d7fb/63222071705.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/na1pim588ek38m213fgvmi6jee/46180704001.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mawunogakuwojakanojopiba.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bda5e980d---67880906510.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0dabbf6cd74a21fb898ee98a2378d771/82141212286.pdfIn PDF document text
    • http://agenziadiviaggiocagliari.it/file/vigovomozugur.pdfIn PDF document text
    • http://e-district.org/userfiles/file/difoliminegetugajurapote.pdfIn PDF document text
    • https://x-software.cz/data/file/ferapegadapavod.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc471e636e---tofavojizewer.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/76424849992.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bfd203e3---296539715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=planet+earth+from+pole+to+pole+worksheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 17712 bytes
SHA-256: ed0715fe2bd3e9ac27b07c3b31fb2d1dddbf6c18b7878ef643b7b85782ad3c68
font_01_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 10708 bytes
SHA-256: 8b660e1b625985ae11c0d16836e9fb68f6f12fb4e3e2eef9efc775c18ee2d0bc
font_02_sfnt_off00012246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd