Malicious PDF — malware analysis report

Static analysis result for SHA-256 87057aab8581bf4d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 04:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7de9b8fb259e21ca91ab3a7c7b05517 SHA-1: 58c73c2e3280571bf07a395360bdf20ad5eeb2f1 SHA-256: 87057aab8581bf4d5886184153787b019a1ea0f634a9f8af3b2cfa05870906ad
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fc0a1e9a036173c1eb54a4670f339d36/fejubutoxogukigej.pdf In PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/63k4csioq7ho052kp5km827k7s/72644489648.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/molexexaker.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/50021211075.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/84696418171.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/447c382eb09833f025616e470cd68549/jipugefek.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e56d37748---82019332439.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/55345247079.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/37492243920.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/rl37am29bkcvf110a545ei0090/vorosojamade.pdfIn PDF document text
    • http://demkapi.com/resimler/files/87863126296.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/33035341965.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/gatapexufewif.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/lufixitojutelogomu.pdfIn PDF document text
    • https://arerp.kr/data/file///voratebojujotumiguzun.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/32995101257.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/28013893960.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tuweruxuweliluk.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41add17726---silataxuxemas.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f47657db3---34597211566.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/99375307771.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5184f545---vunisibagites.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/91097468078.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952fc5593c8---25340555134.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c8c69e4f---bumorevovedojobanerix.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/orqvqa1or06fb745muqr82u0es/86705238912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=osmolaridade+e+osmolalidade+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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 17920 bytes
SHA-256: ade60c72b2365c23aefd3818747715e7d673b87e5e516288c39972b50b869929
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 10484 bytes
SHA-256: a477a75fcf17738142c73a6cfc089168efeaa341a2b48d0594a52bdae413856b
font_02_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1