Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad707c44d8780fc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 03:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c9de8564b62acc2c644b7d27ed865e5 SHA-1: 15fbf76255c833dd89a399f74c95ab5a594f217f SHA-256: cad707c44d8780fc3a86d97b030529cfd6323e968fc8641f903d84c0646d2c49
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on compromised CMS uploads strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://elementsgogreen.com/userfiles/file/xunuxigi.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ks241ha81dirq10s3sui961n1g/43042779783.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zeduzufujutexopalijinaj.pdfIn PDF document text
    • https://afayl.com/userfiles/file/milujigi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mc2haig3bieolt4daapk0h2i72/82459837143.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6995c8ab0---mivaparesaresutepuva.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/28d636a8117e7f7656ca18994ab20f6b/xalubefugapuwigej.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6cc246bc99b2bc6e368d9eaf582b3741/390913343.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78542df991---46557665981.pdfIn PDF document text
    • http://theurbanthinktank.com/files/zawetapake.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/99360740326.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/aa665afe5fae89054f8a35109b1f8ec3/pugenebebi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607324cda2fdf---23932335879.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/819d8a931fc4d6ab7eb48317982775fd/dajutomoxogopi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e3c902dc5f4c84114ef1af7f7934caac/47953063463.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dd7d2a636---69368443103.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075498cba7a9---putozugitufose.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/kerosozulimanelivukiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f8a8d5aee---75781261270.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/18763864599.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/003f70a3e6b57351df7d5f5b370d43da/gotolutefevoz.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/xalebivixupedokukofubimin.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/89603084235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=salting+in+dan+salting+out+pdfPDF 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_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 17628 bytes
SHA-256: 32267682ce41ed58424776a3faf17d5d48d6f5cccaae8c6e3fa8af9d3d41e48b
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 10616 bytes
SHA-256: acd93106ca07f1f26aac15b3490e48940889b34ca3edd54472551918344611d2

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