Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffb05dd5e6b18ef…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 11:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8944c395444224860ee96185826058bb SHA-1: 0a3f5c0fb3eb7db32bf9a24d6ce23c5624242d79 SHA-256: bffb05dd5e6b18ef6a370e0dc63593826948e1f023fc404d78de4bb3bf1d19a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2cd8879b44ad1854eaf9dec5652001bf/89390837005.pdf In PDF document text
    • https://kaowei.tw/image/files/20210914_143805.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/18891062898.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dh38kaoh8euekfsjqecfnrit7b/7086408337.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pc9tbdrtvr7e82opn5h4r6vaae/10617861069.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0245565001631085815.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/43207974399.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/25815752440.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/46708431722.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dipawidifuj.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210914141029.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355476613b9---28729157394.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/35638820023.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/jukowirijajagigofijixe.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/mejajetupijidiwo.pdfIn PDF document text
    • http://fitviewer.com/files/file/gulesapaxudexojemukikuwuz.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/53415202948.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/s8va5n4mp2s07brm45np4pk31m/64677860093.pdfIn PDF document text
    • http://rc-modeller.se/images/file///45208333053.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/44508908959.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/xaluwit.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/zifakokelidejizodumi.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210909041225334.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/53408979166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hd+movie+downloader+apkPDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10524 bytes
SHA-256: c92252df16b82349e213c823f3929208bf633c90f15804bbbf4722ee0419b003
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 17988 bytes
SHA-256: 97f01e9f256a9ebc330aa26c3e1aa27fe8d861e26ce624f7897c4e1ce4dd4551

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