Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f3129d376934d6…

MALICIOUS

PDF

77.4 KB Created: 2021-07-24 23:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db2bc20a4c76cc502601b216f82775e3 SHA-1: 660371d89adc5f51bd7049bad8d6d3813f249538 SHA-256: 92f3129d376934d6fe4faebc7df91dc4e1cc49758f630b609873e259b7beaefd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 multiple URLs that appear to be download links, likely to lure users into downloading further malicious content. The presence of compromised CMS upload storage and disposable hosting for some of these links further supports a malicious phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5b823e58---mixip.pdf
    • http://shukokai-voves.fr/userfiles/file/53947248678.pdf
    • http://penzionklara.cz/userfiles/file/bulinumaxotopelupizewuva.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/41568744958.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3136535da---97443241109.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990107ad5c3---52995968480.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/f999065300ae6742d3a2b11082ed7144/muwitotetutobixatefame.pdf
    • http://berbun.com/user_img/file/kezifomisedude.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/23fd34d774f25a1b37c60cd7fe302652/wusevuretisijujulo.pdf
    • https://galerie-louise.be/userfiles/files/nituzomezowa.pdf
    • https://wickedcheesy.com/images/file/99519897422.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f012842830---danutemesozuzalonexat.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/47034619840.pdf
    • http://feast.to/upd_file/jefezifavivoruriw.pdf
    • http://termocity.by/pics/files/69249733385.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d09a475c3---8290851071.pdf
    • http://yuha.be/_files/file/mafejaviwululub.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aca5758f643823adcaf5917cd003d2f3/36054349268.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c58a46c626---jivexoluloxefumovura.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/2aac84ee7438008154f0f0edbb162422/pafokebemasuwu.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dabe306c08a5a967f4eed071f17cebd2/todovebiwugesoduzeguliw.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c776470a841---devemix.pdf
    • http://lycee-elm.org/userfiles/file/21596198669.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=appetite+pro+rounded+bold+font+free+download
    • 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_off0000c81e.bin
622c65947478ed490507e92b9e26e155803540ed063e791637abb26576022ca2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 10628 bytes
font_01_sfnt_off0000e062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 16792 bytes
font_02_sfnt_off0000f874.bin
f71740c8f90b678f343151677f033b33e648d1c391cf9ff4910da06e589e193c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 17900 bytes