Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b678ac478c95b8…

MALICIOUS

PDF

88.2 KB Created: 2021-08-22 04:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83614c013a2b0064e8cba3157d2f824f SHA-1: b2fe9e4df27f3b785027c3822c1a0123d4835029 SHA-256: 28b678ac478c95b8eeb9b5b2dcd709936471b21bb466bda228af2890b3d10b2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs that form a link farm, likely directing users to phishing sites or further malware downloads. The PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=the+case+of+the+gasping+garbage+chapter+4+pdf PDF link annotation
    • http://ahdongjiu.com/upload_fck/file/2021-5-8/20210508081220215608.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/matapomoperarobuk.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/bufewenipalex.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610069a928dbc---62388502985.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/webesudofesesoses.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9c041114a006e4a8c0f422920974c1d0/rizuregexuk.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/3968469834.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mezexitovokapanaseve.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c059868bf2f---buxura.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/62d043b17055428c13deb67877841872/18405647556.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/c1rlcaqn33jsi16scpc82lkss6/poxijiwofiratudapanare.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/97928436245.pdfIn PDF document text
    • https://tantecoccole016.it/file/24322156795.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/77338355148.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc03243ad9---64828462127.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e910a58c---69635449879.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/49797759245.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/31066947061.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a1b94328---sigojajimep.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/nigudoleref.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f2a810f5f---rukobaresivenumanova.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ss60ook9p39649gqhin3jbtbb0/85653090400.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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16988 bytes
SHA-256: cc46d559fa8aa5b8577306f648bfa521e71326dc852b949221b6256e3d85cd2b
font_01_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 11032 bytes
SHA-256: 33e03b09b5e5cb4e277bb7bb99c7427389526fbc1474b7a5b819faedc1171545
font_02_sfnt_off00013a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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