Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bff8e3bcb224026…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 08:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 656e91f9f3ba28ec679ef89d7c0b9c9e SHA-1: 3cf87567cfeb7631c4d3b5ae5efb744ae0e8a096 SHA-256: 1bff8e3bcb224026c0359c5d834fa6666494e5260540c280ccdb21cf02de45a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points to an attempt to leverage external resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=2016+november+sat+answers PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1e92dfe0347f39450ceaaceeaf91a6df/17434140233.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/gonemozumoxevovekasedux.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11158379685.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021911045363309.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/guzomifojijelasaxikovar.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/futejumefiwujuv.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/59065094203.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecbdaabaf---55033070757.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/35090687294.pdfIn PDF document text
    • https://bawauang.com/contents/files/winemoxiridopagim.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/34288867246.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/94649318242.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/32537109499.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/rugowu.pdfIn PDF document text
    • http://st03.it/userfiles/files/dunevuvivuvuzag.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/lefefebubaxubigifep.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/wojedamivi.pdfIn PDF document text
    • http://epicridesnepal.com/files/fodadadupisulixuxipaw.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c36b684ad---sidepemigifikanatezer.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/nujolosiwugofiroxi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///73263371779.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/35326250961.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/27275713046.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 10788 bytes
SHA-256: 489f67d2dae96f5a87b9163d65c2801c76045bd584c92abfce3372c888e4e7c7
font_02_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 23104 bytes
SHA-256: 97e7f9fab43100296b1bac59f3eec2b67b49f3921cd6e8c4f0d4beec088a98bb
font_03_sfnt_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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