Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ada66f26d0cfe13…

MALICIOUS

PDF

85.4 KB Created: 2021-08-27 02:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c0e0d291ae4552ddf064f044976b8172 SHA-1: 99569b7ac676491a854ea7aaff5261871893ca2d SHA-256: 4ada66f26d0cfe13740697108d84e8c5ad88d407bd3fb14201d05867a782f884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the nature of the embedded URLs suggests a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=if+the+efficiency+of+a+carnot+engine+were+to+be+100 PDF link annotation
    • http://www.contectrade.hu/fckfiles/file/99234938950.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/rujuregidufemis.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/14135999724.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/78155141376.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094695a9da1b---fukejokuveki.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/67660457491.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/woneropojirafozarari.pdfIn PDF document text
    • https://tch.lu/files/files/50562637357.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1o4l724el4heif7ksb5cu4n105/tofapozuvetolapumuwe.pdfIn PDF document text
    • http://master-br.ru/img/file/4945490630.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/1507587937.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/magonikiw.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/99704876770.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/98756716984.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2efc12c8d---69251855045.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6e4641040e15f9b38b28cd522bfd7d32/jedibefo.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/lorixajogi.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/13755470288.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5783ee12---sutakexepiraxinuvarilukat.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/84ce69e16ad066e7bf3f01787ab56694/bakilipox.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/xidufurupoxavovukupunovu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 17356 bytes
SHA-256: f1ff6305d07494f65dd46f78de9a385b4dc467a46a6f58ace886b8a939db779f
font_01_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 10864 bytes
SHA-256: 325450c15eb48734b60988612aaaa2b974a8792e42dc07f24a4f5dddae6651ee

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