Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de934dfa74712e1…

MALICIOUS

PDF

84.5 KB Created: 2021-07-28 00:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b4f324df2b196b9d6ff51b98277b0b6 SHA-1: 776dc34cc83c3535387250cad36ec9161f08895a SHA-256: 5de934dfa74712e117d527aeaf659eeb8070be1c55665fedeff6748321f33473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608febdc99938---gerisiwulenawolejabejizu.pdf In PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11999896118.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b06386f7e38ffabff5df272f494d65b4/5597409575.pdfIn PDF document text
    • http://itfind.ru/uploads/file/debunefemogemizavaw.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/fawokajunelotujetitokivir.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbeeec7e2c0---bepaw.pdfIn PDF document text
    • http://ubest.ru/images/file/firig.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b630ed53fe8---wivuxulagovebakov.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/robevodonivalojusobov.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c7685e53fba6bc3f2dc65994686b8fad/wawivibuxo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0e735b7b8abf3c867ce164c809f37f06/worevap.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/mupaliduz.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/63953206530.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/boretojusaru.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/tnrl3c39qukpig20ulme0lassm/supelidaka.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/xirawotimoku.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/72350498768.pdfIn PDF document text
    • https://people11people.gr/uploads/File/28397062867.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/menavopaxogeb.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/98525335709.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714eaca9da5---74490569716.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/l3ng0l17dv76q8qmm5nsl7qvb4/42001659926.pdfIn PDF document text
    • https://tepihtrava.rs//files/jalifotopunubek.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608686d542262---juninokoluzukasivedesuxuw.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/dalisasidoluvubiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=age+problems+with+solutions+in+tamil+pdfPDF 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://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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 15964 bytes
SHA-256: 3d3381117a669dd70fc3dcf0375551d8a10506d4ddc90be1415e3f6346db9ac1
font_01_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 11252 bytes
SHA-256: 6b70729e40cf5639ff50a905616cd06cd20ce65bada6716efe81a1c78bc33feb

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