Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e9038af5afb62f…

MALICIOUS

PDF

96.2 KB Created: 2021-07-15 10:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba3f52763ac2336576995da99fb5b24c SHA-1: ff8e890b5157a2929ae1ef5c40a624c311b0d1fa SHA-256: 52e9038af5afb62fdf8bf0a3e08b62efbeddc6823db8fdb792e3e4c2aa85fe62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=eventive+made+in+abyss
    • http://samurairamenbar.com/uploads/files/39072146128.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607044b216a22---xobizujefewubodirez.pdf
    • https://classconnbio.com/img-jacson/files/89495167044.pdf
    • https://fotofidelity.cz/userfiles/file/90172379579.pdf
    • https://elitstroycraft.ru/source/file/weporatezuxe.pdf
    • http://fernandopelosini.it/userfiles/files/peramabiwuxejasasuruxej.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lat89javsfl6udivo0bk8aabck/85095859117.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160800965b695a---33007285317.pdf
    • https://yenhuy.vn/upload/files/nonivejuxuzedibivewajab.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a3a232113---88057392366.pdf
    • http://lookkorea.net/userfiles/file/33967153407.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7613b2974a---33143402776.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3b32k6kgq69d4mqjcn125um4qu/gaxefunabelivo.pdf
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/88609152023.pdf
    • http://akhsmombasa.com/clients/861898/File/17256081212.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16228335066373.pdf
    • http://photou.cc//ckfinder/userfiles/files/loluvefirusozofuzebiz.pdf
    • https://toromecanicorodeo.com/files/zofedejuboti.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d8608782---19534452460.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/db1d1069d850ec7b864eb085008caf87/99162761846.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/baratigelafifovarimo.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608996e107435---takukudid.pdf
    • https://crc.creativechange.net/ckfinder/userfiles/files/kurobob.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff49.bin
16ad6940e999e28bb803c4340c65f33745bc0a207abc2369e975925c66ece79a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 17932 bytes
font_01_sfnt_off00012e5a.bin
c8001e20cf480914f68754024790d588df2c1dc74422bde886fda3ba28d26689
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 10448 bytes
font_02_sfnt_off0001460d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1460D 16792 bytes
font_03_sfnt_off00015e1e.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1E 16092 bytes