Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3da0e1e82f85e6e…

MALICIOUS

PDF

98.1 KB Created: 2021-09-03 17:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d4776bd248e4ba999741ce56057bcca SHA-1: a1f00847981109682f0aca7f289ac61a5ba01996 SHA-256: a3da0e1e82f85e6e38e4291f2cdbf5536aa73ef51ffefbff14173407e3ebaa95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=relatorio+de+estagio+pronto+eletromecanica+pdf PDF link annotation
    • http://www.sictombbi.fr/ckfinder/userfiles/files/11328918560.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/74864549700.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a50db4a7---gebasanud.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/47091654465.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/17038008783.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/femunaviwuvitemidewa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9678f2789---gefubuwo.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210524172536_449035013.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/sisavijalimajosivudub.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a23f09cf---xulotunexejitoguxowen.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/bfd1dd52d4a1e5b37f079ea380454ee7/zatilage.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/buzelijeluxerite.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160726e257c039---63460745093.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084181bc0fdd---gikeduzirigudagurewok.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/nimokufi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2163e36d1b---8867861802.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c671baa08---58217259723.pdfIn PDF document text
    • http://tano-cable.com/d/files/22533911039.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5b31db1d4cc0638bf9069dff60c6faf9/dunexapinum.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be511e39a64---riwipuzufezefudebirimabe.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/risoseb.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d080529132---41825911275.pdfIn PDF document text
    • http://prmakeup.com/Image/files/lisemuj.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_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 11008 bytes
SHA-256: dfce52f10507b4525737887df68198795666de18ac5134ded4d18c5b66383b75
font_02_sfnt_off00014534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14534 20404 bytes
SHA-256: 35b97c567e5d34cc5638cd0e3fc0a4ea0735fac6cb137633c86289abc44d4b4d

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