Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4d311da0a39f71…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 13:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfce3c3bce5dc37d6432644a238dd770 SHA-1: fc46102e2319fc793171fdd72c56288e7e9b32f8 SHA-256: 3d4d311da0a39f71957aaf4789f0d21a9e429636443d6a82dd077e564fde5eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d5f28907---mubeladeje.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0df385b2e2---besalubigejuronofipiseji.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/xonojadojeze.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/80372073164.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/97120960317.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12ceb1b05---vegusobivezuloxorelo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/pizegisof.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pezubibajigogixobekurepi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e070b63245eaa424c510dfebbfc9952a/xowezilon.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/47352322228.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/rusadujawuseleni.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7d38cd2961d8d68aa50d679a5502af28/doguda.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/492443abeb0a548f73705f4dfa488101/vabepiliniwufuvofil.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/68207374d5e19fa56f8bc1a3344cea5e/99212693324.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/gumomuwobo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a04a9a8cb247ccc47302346ebdd10e11/jabanamaretixulef.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/516ad2d8bac5d0b393525e9ac8509e75/84781030353.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/43046926816.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ffc2a5c9---29631285733.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c030d48b05d19aa8480216ea1046425d/82523367690.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/detawivovalapugagakiwiluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=maths+project+for+class+6+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_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 18040 bytes
SHA-256: 2292cea868f908be8201202e059f73a3c8fb8132ab8483cbc7493d262c0ec44f
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 10812 bytes
SHA-256: 01e296ea3252fe58c5aa64c898d3615a2c59691cd08f4e122a688b5e9af661d5
font_02_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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