Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d329886d5c66da5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 07:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfa953e52572cf8fa2e6b7565f06ec4c SHA-1: 8158810416c3c8d1619cb44d09a3c71c79eca2da SHA-256: 1d329886d5c66da568a7185f107224fb8f36623ecf8eaec23a68db4828847731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://wpscrm.in/uploaded_files/userfiles/files/43012629767.pdf In PDF document text
    • http://gainliving.com/upload/editor/file/36678396179.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/10258831951.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/48808148902.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1526b534---dowiwejalodamufep.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee3b44d5a---53933883042.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/75854202731.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631855570.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/69649938098.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313383e5d7d---84217418282.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/napufosonesemenapujo.pdfIn PDF document text
    • http://full814.com/upload/files/94118790927.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/falagupirutukizulosixow.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/nitipokewomu.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/13553345053.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/megirufefifalomupev.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/19243450044.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210919_ABF4400A55837A8F.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/negatepifakufifonefabij.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/duparumutasaferorurijo.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/meger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+4+1.0+apkPDF 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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 16920 bytes
SHA-256: 508d484a9c4d17f62cf7438eb2f1a2cee74143bb03dd90f46fee9727ee88a71b
font_01_sfnt_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 9932 bytes
SHA-256: 4615a2869061ef0c38f9280320d3e4931cc99dfd425fde796c59ec76ea13ced9
font_02_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1