Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bc1f78bed5fd18…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 13:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83ddf1b7d26d33d58b4778eef487281c SHA-1: e8fa740d9e8faf2f3c8a983f223b36477af6b57d SHA-256: 25bc1f78bed5fd188a5c4678b565655df1466eb919adff0276204611faa1c101
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm hosted on compromised or disposable domains, designed to trick users into downloading further content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tidurmalam2.com/contents/files/bigegivob.pdf In PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/noterevunelosijanalo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/4578517907.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210909054323_dehz8o.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbeeb61ae---bubub.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16136f506b3a45---90376331222.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/65450501157.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jajasiferomu.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/18367386927.pdfIn PDF document text
    • https://irantruck.ir/data/file/68605089422.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f93d330e8---25474614637.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/daduzite.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210907094837.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/lutonefon.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/45826763978.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/36597910256.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/eec1a850bf92dbdca6d1e6ef8359d228/37949191238.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/42470480968.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/25119874911.pdfIn PDF document text
    • http://www.toptehnik.si/images/jibipiwaguniwutato.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/balifanovuxopipokafej.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/dejezokesixerulawotawasap.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/xoxesomukog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sister+location+apk+pcPDF 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_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 18652 bytes
SHA-256: 0d64d9b798ed7b8bdf962a01d6f8f298d14316faf57432c71d5a7e7e3b608eeb
font_01_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 10532 bytes
SHA-256: b00d9cd1e2725531f9a123b5953888b685f19c2f03fea87ee9976069df2764fc
font_02_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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