Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a13f7940f44ac06…

MALICIOUS

PDF

98.9 KB Created: 2021-08-10 15:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b8c04e76f9f5d2903bbeacac29400a6 SHA-1: 2bc64ccb2b16b3acc65e1f976d0ca40cef72b902 SHA-256: 0a13f7940f44ac06ac04c9ce37156bad9d8a3d1624298209dab4ef4391bfe200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly suggest it is used as a lure, likely via spearphishing, to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A7%D8%A8+%D8%B4%D9%85%D8%B3+%D8%A7%D9%84%D9%85%D8%B9%D8%A7%D8%B1%D9%81+%D8%A7%D9%84%D9%83%D8%A8%D8%B1%D9%89+pdf+%D9%85%D9%8A%D8%AF%D9%8A%D8%A7+%D9%81%D8%A7%D9%8A%D8%B1 PDF link annotation
    • http://kotolantopeni.cz/file/lowel.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/sufid.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/xibajavixa.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/gudujobagewanivigel.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b54dc956---72897037199.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/67180075080.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/10989831265.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07ad52e296---24123690033.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72cb545d5---70466343761.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dbe5e5320---4227854933.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0762888001620290035.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b817a65f064---maretuxen.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/jumawofox.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5020a6124933150a0375eeb17ea4153d/9252924218.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609695e55c95b---13144293039.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mt3fs0h5l9e1aemocqa3b206c0/vumirofumunegazotonek.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/forisi.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/14169286080.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/75625571908.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/86969491788.pdfIn PDF document text
    • https://suksesunited.com/contents//files/49727632386.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aead0cd093---jageterapegizadenosu.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/54096774344.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/zilemekiwa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eb20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB20 30860 bytes
SHA-256: 086342e8e8c78c5d255ab84a4a42b6fbf608d30766126f0b35d4e1b9931d873e
font_01_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 19696 bytes
SHA-256: 541c14d6dd510329db807f44b0e7d50e6061803e66fdfe5d0bab29f32c740bdb
font_02_sfnt_off00014254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 14360 bytes
SHA-256: 99700b2dd625a9c25880657a6fe406ad4ec9b0faae99a8b41e5f002af527180b
font_03_sfnt_off000165f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F7 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724

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