Malicious PDF — malware analysis report

Static analysis result for SHA-256 54957420be537275…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 13:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: beb3a570f707adfd13949e9536aef68a SHA-1: f3628047df4012bbe0f2e99b7a855f1e923ec998 SHA-256: 54957420be537275768a49835e284a66c3a5f94c4fa9cf868eed7703954b06f4
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this pattern. While no scripts were extracted, the nature of the embedded links and the PDF's structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://telegid.tv/userfiles/files/59646345957.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd44855abb---43612379396.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/60494521477.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/mofila.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pefikurawagimibuginotuf.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/20480924524.pdfIn PDF document text
    • https://promise-land.com/upload/file/vojumaferupumideg.pdfIn PDF document text
    • http://pinxedien.net/upload/files/bujidiferaxelezeboxem.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/tugopixatuwuzawarumul.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/bofuxodisuxidegusoxeben.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584dd2f7ea---45475553619.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b5cac60fcd55be6678d3dceecf778a94/wimur.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97a99341d---siwarimukanabumigokad.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/kuvejenefojinopak.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/wepewafebiterekebiguwudu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/50589292650.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b48280f64d58d1ae4b5d6709fba951df/kinupitefuzekotatonax.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/maxazixuzojixibijilava.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kipumopuvivelepopej.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/23839003570.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/16040265783.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/buvup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=briggs+and+stratton+power+washer+vr2500+manualPDF 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_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 11520 bytes
SHA-256: 2a489a71eb543a0c4b930e9427ee82c3e81979605d5b09769ee72f80cf89b33a
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 17128 bytes
SHA-256: 0e609d8f83c77711f0d052f8ee8f3af43109467faea4bf8f67ecba32cbfe91e8
font_02_sfnt_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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