Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc58de0521b97ae…

MALICIOUS

PDF

102.8 KB Created: 2021-06-27 02:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 162c67a1e24dc8c053780fdb15ad6412 SHA-1: c1cc93cfd3d29f6c07add4c27e8ffbc2d6d32088 SHA-256: 7dc58de0521b97ae8a511022b0feebca1b10b1df068e314e9f57424299773833
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised WordPress sites. This suggests the document is designed to lure users to these compromised sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b0d5dba7---79437749042.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29f527502---26241222349.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/10815168d1198357a3e0842e50641863/gafidejil.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f2b49b9cece2405837879582943a1ea3/68902407894.pdf
    • http://ud2-140.com/files/293320697.pdf
    • https://airflow-skateboards.com/upload/file/68273890311.pdf
    • http://18554080.com/userfiles/file/59221837480.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/059846f7249b842cba3c90d7c1f80ec7/fokexowalepafixujomul.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fl85d85pchjvfolvvf2d2ggr83/moweridonebewojakirugiz.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b554a9eb9---kadironu.pdf
    • https://bursakaynak.net/userfiles/file/5679014461.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc913d5727---23543260959.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-10/20210610193132306119.pdf
    • http://ansing.nl/userfiles/file/wazafoma.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1a703f41---44650242519.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/72f4d70636f3a7e5934bf5a95b910e50/povenarexazoxilum.pdf
    • http://chi-kara.net/userfiles/file/70702968049.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/sasinavisevolan.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b802a69025d---59832114647.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/83dfe5ade61a13a7f91f9834fe5acd29/luwifagebaradegum.pdf
    • http://bannhuaduong.net/upload/files/79055543246.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28da0424a---28879721109.pdf
    • https://accuratesearch.com/userfiles/file/26785890172.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7543c8e8e---15731444885.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=overview+chemical+reactions+worksheet+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ccf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 16792 bytes
font_01_sfnt_off000144e6.bin
2b84fc88d82b188e4eaf7d61321ffcaf5d3eccf47e9b794c23a12f2f5fe15848
pdf-font-stream PDF embedded font (sfnt) at offset 0x144E6 10764 bytes
font_02_sfnt_off00015d95.bin
35690681a456bda24e26c0facb7d10e5dd2f30c62cf7f456042545eddfa8ee9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D95 18056 bytes