Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58786bb0e12ea96…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 08:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e698eda7d5d257e5de6e7f14c1364f7e SHA-1: 9ea848c61b50cd7b02cf0d3ebb0ddb7b661f1efb SHA-256: c58786bb0e12ea96d9f1e08e51fed9ec881f1b4cc52648ca03531a362d93b29a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO abuse. The presence of external URIs and link farm heuristics points towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ntwbearing.com/UserFiles/File/lajitalil.pdf In PDF document text
    • http://avsa.org/sites/default/files/images/files/nizekagofiwupukomojega.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af94bd1826---80301297660.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf930d2cc09---taxikunujiwuforu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xetuseveva.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b35557fc---tumisum.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/62710595606.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/51046691004.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1628553373.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d8c1145a8297a8f1d4494311ea6a6959/71464399215.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-19/20210819020755590042.pdfIn PDF document text
    • http://thedreams.cz/files/dodirotejuxegizovu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/236cdf19d7cbff1d5d400158dcfe6c38/bifowujowebiletekuwisaba.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/zotomatewodozafawefigoz.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/dapumof.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/215f3517fb04806dacace693ca737e5d/65545332698.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e74d1cfb0---92408947805.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/46018706119.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/3339036648.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/vexogusozolemuwunegek.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/rakagi.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/47404445294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=informatica+help+pdf+free+downloadPDF 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_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 17320 bytes
SHA-256: c86350691007cc63dfb5c8d8d879df24f0aa0bfafff2e242fd817ff4fb77685e
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10756 bytes
SHA-256: 39c52a9fe8a0a86cec28950cc5fe4a9eae3a62c6ac760658600d651fe533898d

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