Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a7c7fbf680d9bf…

MALICIOUS

PDF

130.4 KB Created: 2021-07-13 21:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 28ba7f726f81c9b28eed40eeb1c9e4f6 SHA-1: 88cd590675de9d17f9898917abd6ff0380549683 SHA-256: c4a7c7fbf680d9bf57994e3a6d7af3612892eff2cc29f838aac6d70c4bc46f0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee6739b23---delapasijigufiwad.pdf In PDF document text
    • http://g-shocktou.com/user_file/file/47677270272.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/04eef4f09d5b921b9b9f86e8e6620ab1/49776180065.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/fusazitosovikivubev.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c99e0ea80cf77c8d2d03cb56b121d57b/maxub.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/nisotatokekakidovazi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7b1e8da4f11c373986bab0416a6204d4/tigijowa.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bibibukufolav.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/fezimobubogegage.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9827c0c14e7ddb7c1e967ad3a40ff21e/vafaxulomik.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0692871531---99943512097.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4708007cf3---wotedopaxitirot.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/7931928591.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d746d2a2e3---3701009942.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/wevakofojakuxadurogek.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/45470755584.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/r33mh1e490qi0jf641v2ure73p/94601097791.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655e68cda8---leroxi.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/84804736441.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/mipivekatodunip.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/31940242183.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7e6882f4a239006a23a371279e3f49ec/18509724174.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3a855ef749fc4cecfeba01fea32dfd2f/62509464913.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e80bd61a7---9573979275.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082365b9ef5f---gevodasomamakute.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f83392d56e1a6108b9f082f30efd24b0/89509214426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=child+poverty+in+mexicoPDF 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_off00019ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AC7 18832 bytes
SHA-256: 512e9ac78401f0deaf46dc9a3d215ef7babbdd991a8d64d4a1f6e1614dcf86b9
font_01_sfnt_off0001cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E383 10764 bytes
SHA-256: 5626494980171869e0073e8268d9ca351983681bd0eb1059532c85b2122b197c