Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23f3fe90323bb4d…

MALICIOUS

PDF

92.5 KB Created: 2021-08-04 02:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 761fe4195b3b0d51ce9c5632302db88e SHA-1: 78a81b0f4932ef2bb121a6abdc289343f8f1579e SHA-256: d23f3fe90323bb4d4290a1511bb15b87d2df9417e0d622a8c2ade98e860884d8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608250addffcc---rusutanegerimufidunewibe.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf7ee24c6---7980758718.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2c7b55e54---61328133804.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a466b6a03cd---gebibadu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fff15cb8388c421ec2c99c4b7251cfee/titonodivuvunu.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/99238290465.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/51d517f71959bc24294bab26887046f9/firorin.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160773472d6b55---76942818436.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/togexezugusovaxepivexi.pdfIn PDF document text
    • http://esistore.be/userfiles/file/38612969770.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3c8016f5da7353aaaf4397c1e863a4eb/87883389897.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/robufimimiwin.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/ximevij.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/fofesudikubu.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/69004798619.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6413bd01a---migiso.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c409c162---26089984316.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/fibeledupa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bih2eidsi7j8kfi9q1atun3ha3/85127978998.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a7171c0f988---39820948029.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/40026147037.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089a42279a60---87426100396.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f861be23053---sawokasirogotazuzologiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=why+is+it+important+to+study+ancient+egyptPDF 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_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 16864 bytes
SHA-256: f48487980f26197dfa56205472bacc58de304720c98db06b8dbf4e452ee576ef
font_01_sfnt_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 11120 bytes
SHA-256: 2d2b817f32ff02741d164317b72c87d30bdb7034294911fd2df882a8559b67dc
font_02_sfnt_off00014aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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