Malicious PDF — malware analysis report

Static analysis result for SHA-256 0affbea4882c73f9…

MALICIOUS

PDF

93.6 KB Created: 2021-09-13 13:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cfe192a288c3ea828af1a37e83fc740 SHA-1: f349164aa36ab55e0bfa8a9e8d620a52c21e6ec4 SHA-256: 0affbea4882c73f9f5296da1c143498a2df57f8d426c5b57fed21859a66c8cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://inwebjor.ru/uplcv?utm_term=srimad+bhagavad+gita+gita+press+gorakhpur+pdf PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135deaf3401d---makofinikexi.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8904094386.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/jefivabuxikufitupodumut.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/kekepijafavi.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/xawifotoreg.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/kazaxi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325742ebedf---lovep.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/25405963606.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649655965f---jisamejanifisepidi.pdfIn PDF document text
    • https://granitnet.hu/editor_up/17960282199.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/xepebof.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/8506646801.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/valoruverute.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nubomipasokomilov.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210906120924284.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/nukobu.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/saroxagirazagezonon.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf92a838dc---modevubujozebul.pdfIn PDF document text
    • https://maturana.cl/upload/file/dapolel.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/7386948125.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/vatorozokunoz.pdfIn PDF document text
    • http://portableandcool.com/files/files/tiwusolozuxugazopugus.pdfIn PDF document text
    • https://31app.com/userfiles/file/65093546976.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7d89eac9e0632aba81ba3c5c66001ba3/43667489168.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 11268 bytes
SHA-256: dde63ae5c922b1217520500a490d7accf93a2c10c40817363dc9ae89abfeacbc
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16284 bytes
SHA-256: d707e3381d1825b7537f622e28c3d5e47799795c638ace14622acd2dafed2c05
font_04_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 21436 bytes
SHA-256: 7319ccbd45c7afbb300cb752ac6e8803c89776342ec0cbaacd8c642d0f02523c