Malicious PDF — malware analysis report

Static analysis result for SHA-256 0897a0e703eedfb2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 19:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f6e5db2df09ee5942d498552b08be09 SHA-1: 42cc2558592118ab5fab401b489b8a3032ca566b SHA-256: 0897a0e703eedfb2b009390117ac32b7564768710d02057ccfc91a4ee47a5a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=john+deere+manuals PDF link annotation
    • http://dakmoto.cz/obrazky/file/94045973503.pdfIn PDF document text
    • https://seikai.jp/free_images/files/79354510369.pdfIn PDF document text
    • http://boxethai38.com/upload/file/3554755499.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/folozuzinoxugapurasaxiwim.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/58072644629.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c075bda1d---nakusakubojapujilub.pdfIn PDF document text
    • http://khocabien.com/uploads/files/rotuxubukorukof.pdfIn PDF document text
    • https://10fci.org/userfiles/file/58651935036.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/43976873571.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/nekovupoxe.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/naxuse.pdfIn PDF document text
    • http://aurora-c.jp/files/files/21275916145.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/bulesemobakadegojetorow.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/vezekabijojepita.pdfIn PDF document text
    • https://eclearusa.com/images/file/7261542059.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e672bdfb6---86149258583.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/rujofi.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/42051935940.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4e2c507b6e7cb38ae4faf6669443dd1c/89942059218.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/negizolupalizem.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/40243334396.pdfIn PDF document text
    • https://kueapem.com/contents/files/baxodetafilaselij.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/botajuguxiv.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/5934934598.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 10416 bytes
SHA-256: fd5472f3a1e64466581bc9cd956356027519575a8fa5637b7660c2ce6f9a52ad
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 18056 bytes
SHA-256: f8dfb09bcdf822b591c98a25fd03ad37b13dcd408abc802faa7f502ef0a9a6aa