Malicious PDF — malware analysis report

Static analysis result for SHA-256 79616c5bd9d520b8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 19:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc4e8d6f5918c174a94f4408880ca8ed SHA-1: a84ee7c7f972449dbac8bf492b9f2b299b6a4084 SHA-256: 79616c5bd9d520b87901c38479102a06c9f6dfa171916cbc441f275a01b78733
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. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute phishing or malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/afe3430c1454b8e0d4d9ff28876754d6/pukeromamerujedifikez.pdf In PDF document text
    • http://thietbixanh.net/uploads/files/fepokavozow.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0ade6054cf1bdc3a02d4fc461bfa9da0/69063054048.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb45999642c---zenekebejemamaxeguv.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/55724624409.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/66544619164.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/babuludirutawuzujetosilok.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tekikilurax.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0a4e38613---15095084156.pdfIn PDF document text
    • http://balone.net/_upload/file///gomadaf.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc08081fab2---21493640534.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/1935158402.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/q5sa02jokc6gpmfbr8b9ipu02a/pupalewodidilenam.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f7df3463---ziwimekutekasuzelox.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/gifapewazuvuxug.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5f66452e4adb04548a283fbc5a367605/75586761668.pdfIn PDF document text
    • https://linker.tw/files/57307853698.pdfIn PDF document text
    • https://numberonerevolution.it/file/82371376403.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/66474269189.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739a78183cf---jegaberimixosaju.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836372c187d---34773836573.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1a6ec1fb01a3ff7fc41a3f2b66ce0df5/58687847004.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2114a9a2fcf662904614eff8e60f73ea/32848251933.pdfIn PDF document text
    • http://sooclose.eu/upload/File/74311992638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tabela+cations+e+anions+completa+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_off0000c31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 19820 bytes
SHA-256: e9210c6976e8d7e7e144c6ebf66c05cf9762b1b940215e519b1c242c4e6f13b0
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10784 bytes
SHA-256: dc70fbbebcb752427ece8cc3039872c424594449171ef62d119c92f18b446463