Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aea7e68f7360710…

MALICIOUS

PDF

71.8 KB Created: 2021-10-03 21:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c5753964cadc7718e2b13f3627ed8325 SHA-1: 2ec6f9e37390f2fc1a71637cefc4f6a43c1d8ffb SHA-256: 5aea7e68f73607102a488a4285e6daed2e1fce9e0861795b4d3418afa21cdcbf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or redirection scheme. The PDF structure and embedded links are indicative of a tactic to drive users to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=how+much+does+it+cost+to+replace+a+camshaft+actuator PDF link annotation
    • https://100tmt.com/uploadimage/files/20210916081140.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/26485595191.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/zovadaregibe.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132a8f79c605---nuvijagutawibusisosomor.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/xigovarevetejajuse.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/77064364331.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/totovenerogiwive.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161348b9ec7b7a---nosenured.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595cac95735---pubigifod.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/88094873082.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/bexerubikiwu.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/47563537845.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/34701128002.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/waxuf.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/muzikokobixu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613183e6a8b09---velabidadusedora.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/80470793189.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fdor5b83jvf4md9k2mpttkqm06/fojekiluxarumewo.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/buligosulizel.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/sapunamanime.pdfIn PDF document text
    • http://wirheiraten.de/images/file/12008329664.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///xemonatub.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/zezuzunodaligokuluripoz.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_off0000b469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 10956 bytes
SHA-256: c0bc2f5ccbc3eb2790677e4b20c56402debb10fd56612ca98a4407d2986e659a
font_01_sfnt_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 17000 bytes
SHA-256: cc9a9d152367a341a8d39c5e9d9380c7d3c32adccdc984b57ad2ac16ded0790a

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