Malicious PDF — malware analysis report

Static analysis result for SHA-256 f074fda396954337…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 16:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57a1b72921250cd2b5e59e04f48c1521 SHA-1: 8c24cdd6614cc21be97e7aea52eae3b6e8575f55 SHA-256: f074fda396954337ad0fcc1b43809a4174f7a781f14dfcd80b5e718fdb49dc4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting malicious sites, potentially leading to malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160840655bc4a2---bojaxewawawisujile.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e711635058---13497014536.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2d987eb561dbf52563864c7f49fdd293/61190733889.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/82300858707.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/98235412062.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/25023555676.pdfIn PDF document text
    • https://schmitz.cz/res/file/vilakinesigikesoxupiferov.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/vukolagirawovavepedoketat.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/lufixebuviziwob.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/xekobufu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acad332569e---2583816404.pdfIn PDF document text
    • http://kco.su/userfiles/file/jowotuz.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8337039b838b261f33ad7efe20c4ab4e/tamuzunan.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/48edc52d0819ee0605189c6f84cd6304/28849194545.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/34291310995.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/60c07d3d1cbfb84b276075981ec675ab/45867500411.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3022e74c---rabedufonanoko.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/21059613198.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/talumomoxuke.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5969bc2ec---15291471107.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cbbb996e1---sevasowawagenomamatar.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160724e8dbe49c---wozivabole.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/sezuwalosojamubonabekiba.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/xinivunalofefowawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nuance+pdf+viewer+plus+windows+7PDF 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_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 10792 bytes
SHA-256: 89dec2aebe99057b05a261f733b3fcc8ae8bc9d98092091f8bdb344b8173eb7c
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 17780 bytes
SHA-256: 813d719644ddffc7001c1cd6361e72b6dd1cd8fbb5b6299bd4481949359eabcf