Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bfcf690e6dacc4…

MALICIOUS

PDF

103.7 KB Created: 2021-07-20 08:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 973c25376aa5dafbcd69ab354466d567 SHA-1: 6e032ff1b50d0aec377f64951b5da5d58f6e2215 SHA-256: 09bfcf690e6dacc4afda2b9f78067af85ec0a663c762b49032b197f2cfadfe49
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/5829953112.pdf In PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/zupataragajodox.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9258fdc---63010451216.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/sumelibofe.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/45752873582.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216155385272.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9a72a088b54753704aa7f5f385bdf89c/fowejomejalufofugosad.pdfIn PDF document text
    • https://jobtiara.com/files/files/nizidi.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/rofotimedejamalavoxow.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20fc5b62a9---kitakanonediximiwu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/krvhuhqqqs9ul1nchuaessmckj/68833977881.pdfIn PDF document text
    • https://egca.fr/userfiles/file/moxeladesimufiguwegiw.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/mikowapazuwuretitad.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b2a5c4a5df2fbac8022f869371a42f8e/93284096699.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/vilewerakusavi.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/68039463304.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2c439179---42030636404.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7183194c2092c97491e191f1c1c7d429/tebajawumigesagigejuna.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac1bce94b51d3219e8ae043d9e8a01e6/2270889854.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/39818607198.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2feda86f59---28482066233.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc84f842a9---gufazagulimanizilenod.pdfIn PDF document text
    • http://drironcat.com/images/file/61050271819.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507075413196.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082a68432c79---xulegagerire.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e90a94c6a5---telivadijolivojobimix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=laser+questions+and+answersPDF 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_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B77 17552 bytes
SHA-256: 5e1464dd549f8ad6996dd15dd112e3dba3d6b64cdbab1d6c43f3dd4ab5571cf9
font_02_sfnt_off00017982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17982 10484 bytes
SHA-256: b1c3a2d1e73dfc546a4c189eee0735eef20e5a796a0965027001546ce9eb4a3a

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