Malicious PDF — malware analysis report

Static analysis result for SHA-256 0457eaeff7a13c8e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 00:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63994385717ddffebe2b37082dba7871 SHA-1: 442b386aa8dc490dfc82662d5534c12c320ade9b SHA-256: 0457eaeff7a13c8e9266d598e089a8f1926bde740bcc326146b8d794b397c433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users to external sites. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=importing+contacts+to+android+phone PDF link annotation
    • http://arabic.cz/ckfinder/userfiles/files/tagebur.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/11724948489.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b422ccb10---nojufemik.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5b83349cc3628a832b2328a231f22e7c/13664584548.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad5787684---34318023543.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/luborigofuxewajiva.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/vagidufetimitotipatozasug.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/65910099948.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/51978392851.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/mafagelegazadabajit.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/92534274964.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/12e4108c9f88f5784c8118dd45365f58/wuxewafiseviresowepanu.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/51002b34311ea187c8fea058a91cea50/sumopalozotad.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/1176539291.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/5955400226137d392c4afb.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/78661262435.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/10309107947.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/40965098096.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/fisukavekizadidifimebewu.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/dezurozebimubas.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d65f6978fa3978bfa294c4b1b2ca350c/terofogeluxologetagalogit.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/bekoxabixab.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/39335758987.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_off0000b0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A3 18376 bytes
SHA-256: a24af1518553c911d61845edf36bf74f53e4ebd0c42de614d20fe6bf987d3edf
font_01_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 10864 bytes
SHA-256: 2e0672e946d17ee9002d26c507265c25925b34b87395455e636913b7dd45e311

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