Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a15ea6211a0400…

MALICIOUS

PDF

86.4 KB Created: 2021-07-31 01:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8ad752c2f6f1220b0a08a9df62f96c19 SHA-1: 98cbee0436c1e4e98ea985d505dd24863d94d0f7 SHA-256: e7a15ea6211a04003c3cee94408830f9930a0d5b1e27669617536b9634ff3f0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to host or link to malicious content, likely for phishing or malware distribution.

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 http://esipro.fr/userfiles/file/duxivopuxujonerebaribotu.pdf In PDF document text
    • http://pokemom2.com/uploads/files/kolipegufurexadoguxaje.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/84c40b85f430b86674445bbc4c9ec3e5/lolizivinaxep.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9705985e6---26017792801.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/92222941009.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/rajedumuzaxexapexe.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0047841001620177894.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/093f694394ac235de7a2f581cd7401e2/fukorilusoritinuxozelemu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4b1simg9aptugt4s77i68oc3p2/74382784229.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/48362807280.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/rupomododagufogawepikifis.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b95efda57b77592c66747b104b9b436a/kogifutozisogubiratuji.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/f31df632d46456f4c867643ac68d935d/5102080493.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e15db419e---bevoviwimimopapamopufezo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/462766eced924de5b15f9a13f4fad144/mulomegoweroxu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084345ad6213---tijibobixiwipidatemuvema.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/84755314609.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720a7b584af---34489142123.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/784a0c745a2b9975a572a8ab4d6c9f76/widexaludokewajapige.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/634601d2d621f69e95f7f329158cfb1e/fifonifo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/vulg91gc4v83a1bb05f0vg30lq/68721040205.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb460a787b---44517432922.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/87912604074.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e721hqveo1ebo73nilrqi02d32/fobirurekopexorederetelum.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/33858252494.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/38202851568.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lelovorureserawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=is+vidmate+available+for+iosPDF 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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10568 bytes
SHA-256: a24c0cecade6c6d8ce6a173ee664eda89a12e0f5c6dc6b5464b9dea4223cef3e
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16840 bytes
SHA-256: 4b95256af5ea085435992588f9554b73780c213c3b15191d08f3761f3383cd84
font_02_sfnt_off0001339c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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