Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf131869372567ab…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 20:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5c216d6417eee77ebb396b6ea1f80ef0 SHA-1: 77d637d1509bfdfb16edc1efd717644147186533 SHA-256: bf131869372567ab1b4564330ea39773aee8acb412f617171815368ad0b5b696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=objects+that+begin+with+e PDF link annotation
    • http://liderzy.natura2000.pl/imgturysta/files/rofonobigobugep.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/vonegexopafedu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/34949187963.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825b70d45a---70627296002.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf6f84c2b---garafetom.pdfIn PDF document text
    • http://geoman.cz/data/file/11961419868.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba418269ef---fawujotukipobowagovuk.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/jomedoji.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2d26837f0b5dab85d89e12ff6eaa6f75/32312295772.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/28633721822.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/sazonakapemi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4daf734fc47aa52f2f3100dbf87cf50e/29958220430.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/tuwiguzasuzow.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cimq42jgcmi0rp8m5j24c5va66/dexolapami.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/98826664782.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/96348768466.pdfIn PDF document text
    • http://minerva-collection.net/files/files/50912210176.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dad49eae---17571276394.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/579b97dee8514c2ba041fb24c3c14369/pizaxomilipefavi.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/50020096215.pdfIn PDF document text
    • https://stormester.no/files/file/lonelogutefawut.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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 10624 bytes
SHA-256: c70d4424bd2bca5bd4bb93d328a8ab4d680d5ee5b4a755e072caf224b242a55d
font_01_sfnt_off0000ca15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 17300 bytes
SHA-256: 0a152d4e91b0a1b336d563096c65bcac85a653673ac52d4eb24ff9dae1cee3df