Malicious PDF — malware analysis report

Static analysis result for SHA-256 df74bec1803d57ad…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 00:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53ced50e4423aeb96379731e0a599e1b SHA-1: 8e677f703583327f6f8350f49ed5cf4ab981dc5e SHA-256: df74bec1803d57adc1d514328730960e22a98a9709d6a2e848113c83beadaba8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of a 'download button' lure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=download+apk+for+windows+10 PDF link annotation
    • https://99shayari.in/userfiles/files/kevabadiguwu.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/kusulifitafomidun.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/mevuwi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146502b04122---67376520417.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/31155638848.pdfIn PDF document text
    • http://boldogelet.hu/media/romun.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/59369356233.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/95606813252.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/59614131571.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/49348979748.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/sibupaxetupurigogejif.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/boparewo.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/99025034423.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/53422248222.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/72648210145.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n1207ot5j7pg75i0dbbmaha745/zotugalixadetarerifunafis.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/garovofugavibu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/govolibumojuzew.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144e08f9788c---roxokisune.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/bodotanesi.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/dekavumuniwalokozolejimul.pdfIn PDF document text
    • http://tulga.ru/editor/files/55617132900.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/mekivisoken.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/lukexapikimawem.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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 10612 bytes
SHA-256: 4e0164bd434945d3e88d835f487103418c403614acfd72be0307a76b87f75a4e
font_02_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 18696 bytes
SHA-256: d5144335fece3b5b4511511208dcf7de1d34480b7e24f23f5d75489b2194eb4c

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