Malicious PDF — malware analysis report

Static analysis result for SHA-256 738814f533231cea…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 08:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa2d341f21b87d2b4ef6746337388e2c SHA-1: 514a05522cce21450477a3d9c1322db6f6351f5e SHA-256: 738814f533231cea45a4304173bf80b5949dbf00bb1680aa5d49e5291f5fdcf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ketchas.ru/uplcv?utm_term=the+silence+of+our+friends+pdf PDF link annotation
    • https://samarpanbharat.org/trila/userfiles/file/81380851018.pdfIn PDF document text
    • http://effekt-film.de/files/file/nukirufotowelojigufuboxi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3aa3d0582a0126e4373879549fe40f36/mopimasokirixe.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/tekanunimupupikisasaw.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/29140129758.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/ruxazab.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e173e40089---83168405275.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/71107699518.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/tupulegosaposizovewimadur.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/38b8fec77532b73cafcf18cd2dd1d52c/dufuxowutalomokisejaduf.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/golomugowalega.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/vuxari.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/75657756494.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/68923681958.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/magorugelunedemiwota.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/69904408253.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2de573b7ea---44248627461.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/c010a3505kh6eq5u3q3sppk41f/savosu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/27dc6f5e7bb997352a6866ef548e140e/mowikogipobox.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ca8e751d---zexeku.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/26f0c1bf55f51001cc664187a8f80501/96531628502.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b86cc963abf---82228396621.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/kajuxebugemixe.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9ae0720d3c2aa1121c952df047c542c4/35211319295.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/79952338086.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f47338552c1404340cc3db2e7b1edaad/21635217116.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_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 18840 bytes
SHA-256: 58227c32870a740596af8ec9b0e944964468ea7a864e696106edcc49ad9f3878
font_01_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 10520 bytes
SHA-256: 18f8676bcbd2072f8b382ebc9e47a061f3fb077c1c937387ad443c626ebb5e34
font_02_sfnt_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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