Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd60d97fc4b438e4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 11:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c041319aac58bfbf3c24169b5885f935 SHA-1: 7161c7ce49ff651091b3ee5380f0313dc6461efe SHA-256: cd60d97fc4b438e47842569f727ccac42bcbbb4dc8a5e463fec6ee322e7ffc62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://anael.fr/fckeditor/userfiles/file/lidizosolajipejor.pdf In PDF document text
    • http://popnmusic.fr/userfiles/file/97531005826.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duzupezozokonatovima.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/34440087589.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613484a81c424---jigobenozexu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4be78d968667ade7e5348cf0c46a5ee0/kukefodipobevij.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/lavubuvaxosanojukatuxotab.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/39141841146.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/13689132635.pdfIn PDF document text
    • http://elsped.hu/files/file/furalelarovomuvunim.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/62285643507.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/soxosegogajefuxepu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/46839551006.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109070159472303.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/73907826644.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/52887827489.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d1cc934b2af59a4112efe6fbe0bc7209/53818228757.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/9643167839.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161421251b2dbd---28272726615.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134733a80073---bikobisinipig.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/61018900426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=com+google+android+gms+latest+versionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553dc356b2---36448202040.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_off0000b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 10688 bytes
SHA-256: 7cfb01bd362493e808590b35d2b0da83b53fc7ba11c4545e2c4c5483e7cab3b2
font_01_sfnt_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 17604 bytes
SHA-256: 7a24d8318abdcbcc4b9bf9bd303059211ea3f07ef2b5cee194cdca98d6d77732

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