Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc037e92b3997e1…

MALICIOUS

PDF

75.1 KB Created: 2021-07-24 04:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e90279a96cfb6690ad46c57ecc33fa0 SHA-1: de1482cc1b71c729332d0b51fc485a7c495f23b6 SHA-256: 1fc037e92b3997e10ee88b490551ec8e691f3317fd8f4b0710f05f7705c21581
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including one identified as a compromised CMS upload, suggesting an attempt to host or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://resheto.ru/users_images//fck/file/94239659390.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/47a9c41ab81bbde98d49c7c3488a96ac/jisawuzipabuludalos.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c3fa641666681ad5ee8af73c5054c51a/sobenejalodebemetazuz.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bca2cb5c2ad---dudolitimunivisemudul.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/sawirelakokiw.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/vuzaxebupebi.pdfIn PDF document text
    • http://pasted-radio.de/web/files/96945246761.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/jejeganavofofuzagozav.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/16436654992.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/18529919652.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4022185e1---fuvapepu.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13205783368.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/f41cbc6705875c12de5fff21ce16bb71/60906162820.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c9e6dd29a---92692357594.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/wifapitofevazudetozidajam.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/guwadakivo.pdfIn PDF document text
    • http://xycrusher.com/d/files/64153185874.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/54850989126.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d066abd0761---11549856342.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/fosofunesazovov.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bhg0s76phmhgs4tl23fn8nphsn/bakeletudu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/logukubagugimonisiju.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/617887779.pdfIn PDF document text
    • http://strandedtattoo.net/file/37414433589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=prentice+hall+literature+the+british+tradition+common+core+edition+answersPDF 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_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 10960 bytes
SHA-256: a3e790227d6aa1e11c629cc977b265f1912225471ac5bb65d94efe6415d19f6e
font_01_sfnt_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 17720 bytes
SHA-256: 4cb6003b223779cda1dd3bcf8a979c4109652e272654d951a49621ae6612d560
font_02_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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