Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c77d366af6883e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-30 23:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d6b58417e818c2e428aed034c13d99d2 SHA-1: 624bd799e675c679125afad3f71623edb512ad38 SHA-256: c1c77d366af6883eede23bfed82db5505db72c9db61a0458211a3102e63a5191
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' parameters in some URLs further supports the idea of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://irlanc.ru/uplcv?utm_term=parallel+multiple+accounts PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387ea738150---40335817599.pdfIn PDF document text
    • http://akvarium-olbrecht.cz/upload/file/robudufukevowili.pdfIn PDF document text
    • https://km2804.com/ckupload/files/piretisad.pdfIn PDF document text
    • https://datenglagi.com/contents/files/70959419479.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/seduxix.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/sizigo.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/69151127553.pdfIn PDF document text
    • https://kham.vn/userfiles/file/14510765762.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fikixalixabotizogizoti.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/87382987123.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/16466961428.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/47562223896.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/rapet.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/dumuvijagagonelodotax.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202108312147196605.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54756623353.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mq9umb4aloafitskigi8mjtoc8/rapaduxomonob.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/tuxepupirogejutudimebuvaj.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/zedosedomusu.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/78671105430.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210904_001151.pdfIn PDF document text
    • http://checopharma.com/upload/files/2703889900.pdfIn PDF document text
    • http://regmac.net/userfiles/files/loxudete.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/59149d6228f3e35ddfc91ff915ba0a20/marawunesebukakofanas.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fca4cdcdca4d0ee621e3cac171ac42ec/10752878324.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/dfc0da8c0fa3574413b9508eb79b61a0/27997555025.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/38191034613.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_off0000bc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC17 18040 bytes
SHA-256: 9d72bb5cddb27d7e1fad41b295fa80b5758786e5d32560189b6cb17c79eea7b7
font_01_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10636 bytes
SHA-256: 704f6b8032ece1c912f076de20270b5b416a25722446418811cf62d38753e585

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