Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d25d34856e32ac6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 21:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05679dd7534fed1fcb002e1eac936ab2 SHA-1: 5b937bb9125f16421044e7922d15ac85475a5c48 SHA-256: 0d25d34856e32ac6f41311f43dd69a4b48310ac84bf62dd1d041d6ddb95f777b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=the+art+of+computer+programming+pdf PDF link annotation
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/31782876670.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/bujulujav.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/majuzi.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/laris.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/61354546846.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161312bc0a5511---bomomiwumaginenovosejiri.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314376ab525---guxodap.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405e64bb02c---70450185055.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238e9dcc42---sawokimasetaxa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412393cb724---78485362646.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142133f9085e---29612628048.pdfIn PDF document text
    • http://greenld.com/userfiles/44353640248.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/27156055926.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/kotefapekufata.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/tifubenuwefidogigomufafi.pdfIn PDF document text
    • http://gibisch.org/files/files/73391954708.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/59777092122.pdfIn PDF document text
    • https://edarky.net/data/file/75446810493.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/76299096360.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614101e99fe11---vokebomikokom.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/zivedasoragud.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/tupizivazipa.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_off0000b1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D8 15016 bytes
SHA-256: 6052104319261661e44904874caf040c7642203fe34f4418d57a30d1cbb9ec2d
font_01_sfnt_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 10916 bytes
SHA-256: e3d3a018a1632be093c8d7862ee6152bffc0490b053c7bdbc0065d10e74a444a
font_02_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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