Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fab8af6ec1f27a6…

MALICIOUS

PDF

93.1 KB Created: 2021-09-07 20:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 565faafc25165a9713ebf14621128ca1 SHA-1: 81e4d4e664555a1eb437656ebae8c30704246b9b SHA-256: 1fab8af6ec1f27a619af4da74eb05f3a52abfa55474bc63180c82b4a0896c854
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially compromised or disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f17481d0866f75ab1cbbe5952c7d5f49/jopebutixalidikitadumiped.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/aeua4lu71pg6c4gm7ak0499bn7/wikuvu.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/vitizaseguxudenejubaxeme.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e71d3eb56---78002953304.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/62995479507.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6560380760478c3b49bcffcd6e5b6f1f/61805060462.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/zudovinimesuvikuxagawe.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/41089169187.pdfIn PDF document text
    • https://unosms.us/userfiles/file/35220052125.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-31/20210531224336352619.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/sunizijafiwesi.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/totokujiwonaro.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/75hthrmeh357d3bf8mo4ikfh90/jofolomiju.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/53486222116.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/guterexogubesidewetilopov.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b906de37ad2---tepijeli.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/23e0981e54f194ba33efd448a23c339a/70199758882.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/wigenigusuti.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/popufo.pdfIn PDF document text
    • http://lcxcable.com/fckeditor/file/66418793657.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cml4trcou75aqt00kgce8fucpd/8875597511.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e3deafef---vibasafaw.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3644a32aaedac13a29e6d7f2ea451b25/jogabevisefa.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zitefeza.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bh6hb3p34os5hr6n7m1qn0tqi3/poraninekawop.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/31c6e69c9f2c5b36d5a3785f16133f40/maxelapuxidixubemukezit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=annamalai+university+dde+prospectus+pdfPDF 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_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 18580 bytes
SHA-256: 9a8d62e49511e22a5a3ad27cce118bb089affe8fed580a861961b6e37d05bb11
font_02_sfnt_off00014c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C63 11044 bytes
SHA-256: a20a1bbb64c69d6dbc8126a4e486301c7fb0fffb2524fe41bcd6f97ed674e398