Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adba0b295e228fe…

MALICIOUS

PDF

98.7 KB Created: 2021-08-17 02:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 97fb845d36f05e6da6f60a0c896c7454 SHA-1: b89735d5ea977bf9781aa5f25e7d7b0bb1debee2 SHA-256: 2adba0b295e228feba4de5eac2f5ea916d1df5d7ccfd1b5db289e979a72bcc10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute malware. No scripts were extracted, but the presence of multiple external URIs and the link farm structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8i400euif8vmftfdhoocsr5ao5/82573679241.pdf In PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/22329647556.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072635401934---73820954214.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/kivegadikalokuradipaluvi.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/fulipavuwekidifakiv.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/94912634636.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/jikibigufabuxadajotuboluf.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nadusotugu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d240654190---zegagodedam.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/31906555058.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/davuvamupofi.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0e8929ce859e39d7c994b7a98e66293b/83766491661.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/52420343042.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/rolekijakuvanawenawi.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/17627163989.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ehnlad2m7cm186g7kjpmj19ffi/xanujuzaraxasujedozez.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b28caad71---10112871659.pdfIn PDF document text
    • https://angkalaris.com/contents//files/46498435610.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/45749aefcd6e5d2ea941375ad5986c74/pufuvavoped.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cde35de0d---64674116308.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/wufitexolutoxujiruxakog.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf9a92e43---53730719397.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5763be6ee0---17615202451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ejercicios+de+electricidad+resueltos+pdfPDF link annotation
    • 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_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F9 10720 bytes
SHA-256: 642e59d9fbb6875db504f4c161e55d8163f4aefcb64b6a8ebd184ad331380854
font_02_sfnt_off000151aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AA 19388 bytes
SHA-256: d5e6eeede60e09d8d7084dda51eaf32501739ce1fd977c885770ea67d95b8024

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