Malicious PDF — malware analysis report

Static analysis result for SHA-256 3697e7fd77f4d2ec…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 08:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9dcc17bb81092379bcbf4ea0683de17 SHA-1: 2a35c072dfe976b29bda71cc040f094584464808 SHA-256: 3697e7fd77f4d2ec2487472a1e7f3dad39f30e8efbf8de8a6f91d44103e46590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://biolabsrl.org/userfiles/files/burebesilibejapanigom.pdf In PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/dijijizasukuxaf.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sajomogepo.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/risigapodo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16093370316e70---tukidete.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/16154889317.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/63119395870.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/devusip.pdfIn PDF document text
    • http://rubensova16.cz/files/file/38033821586.pdfIn PDF document text
    • http://primaneighbors.com/userimages/29388982215.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/dabategaranezibasaze.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609500a7b10a9---99758361249.pdfIn PDF document text
    • http://esejsc.com/upload/files/53500044650.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/14423938136.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4d9152ef---79467805467.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/wopokixis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2ec891c81---lojiguminudomap.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210902170145.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/faq996892u5vbq9d0o1qgjd7b4/wefigevumuxumumabimepuma.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/depakujujuvad.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/63264199871.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nuputum.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e6084be9d20---8855774104.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbaf77cab---zesavofif.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160947b0e8d9f1---sowoxopizusamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=verb+tenses+esl+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://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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 10224 bytes
SHA-256: 0393718e1ed3f661a064be1f2c9d06c71ab0c4e6ce8aef7ee8ccb38c004b14dd
font_02_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 18232 bytes
SHA-256: dae77e3b612b2cfc33f157669cb43c7c9390505d527b22c566f8d73c0e5e1f03

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