Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca22efa80cb7bb0b…

MALICIOUS

PDF

88.7 KB Created: 2021-06-17 12:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a41d6eba9dab2c7ddbf30e06f12f4ab8 SHA-1: c7da06f3a31b4a75149f654442e5f75ddc4f934e SHA-256: ca22efa80cb7bb0b5fd1c577698e3d113643c0d62e897c6c3de4de0c78ad4480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7geqct1epib5ujnvrmn8m2b2b0/63150517831.pdf In PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/47270429220.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/gorunuvetumaba.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/teqk7kg4f7k063207qqo7tl5fs/fenikaxefefutole.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606da402a4814---97340347520.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebfc11d41---kukezi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ae5e2ee8---lejikixogabo.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/47437305429.pdfIn PDF document text
    • https://actorconseil.com/files/file/87834127938.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t0eaefjt58ma7j0r6mo15hk9v3/13844858391.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/nq62v6c0qfl61codnv3mp9b1b5/nusepatesupiwure.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608a804327c23---wigepun.pdfIn PDF document text
    • https://isosklo.cz/uploads/zutidiral.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/59a44836ff30522bc006a1d11e6e87cc/75635477316.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3e41e9e8---3951600129.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a065078b85c---vuwatozikokabaxog.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/84634585805.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/c0ab2bc498db3fe2fdd21acc7ae6771e/37778191397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mon+ton+son+ma+ta+sa+mes+tes+ses+exercicesPDF link annotation
    • 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://scripts.sil.org/OFLIn 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
font_00_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 4988 bytes
SHA-256: f239c6f841bb1c272f32669fa8f19d21b2af5f8e2bce9d525e9853b0d43d1eca
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 2884 bytes
SHA-256: fce08cb36c02190e5234935b5ce96721ec3e58704b0a10ee1e41e1ff4ce6bd48
font_02_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 19752 bytes
SHA-256: 05e52ca42b2935688cd701c1e9bf6088b1ed0a785acda2dc56fa19dd5df9e394
font_03_sfnt_off000142fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FD 16280 bytes
SHA-256: ab21a9c855698d65126f177310f315a427e6cc4fa12f323a9eb18e247f7e7f7b

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