Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e76cfba3a5f5954…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 03:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4937886c5a3587af4aa3110c9f62d6d5 SHA-1: 4188db7c7b3bc6eee894b04c6a4ff13c9c80a221 SHA-256: 7e76cfba3a5f595432bb3e0c99d823b13dc9ba12898faf16456ae7ebdb469511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://qzgj.cn/upload/file/tataxukemasipa.pdf In PDF document text
    • http://inistor.com/ufiles/files/pakasago.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/59640905711.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/fikig.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b5e4e5a9---52223791355.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/46005626020.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7d9035460ead38b02532a4fdf65bc872/mudogoxuxupametirabuvu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fibiruguwokad.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a49dbc26a2b4dc34f2247c1a58a3a208/20991509276.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/46765048545.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/ruduvinanarenusixosov.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/66023536310.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/21952870001.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/97142596906.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/50905966959.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa868d09413---15918569698.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/xugitiwagunevujaw.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f436a4941---45178745656.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/lokodosuvap.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c350e74edcb0be0c1cc2ebe790f1e6d6/59110711768.pdfIn PDF document text
    • https://faceless.me/userfiles/files/84828720407.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fodepoliliwiforeluni.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/18347342773.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/mujidofesobalifukovatesiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sas+survival+guide+pdf+espa%C3%B1olPDF 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://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_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 22492 bytes
SHA-256: c622307d8f994f1a16a76a4b760b1b74a21016615f87ca461c2f2e82327a36ef
font_01_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 10916 bytes
SHA-256: c78a90b3051314cfa07ab4140e255df46b363ab23b9aa6dbb664ae221a30d1e9
font_02_sfnt_off0001351d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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