Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf0c01105488f59…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 00:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 839a7145ce9d5b81181afce184e2cde0 SHA-1: 7805d6fc62dc3c92cf8a15c8809aed57c6cd8707 SHA-256: 6cf0c01105488f59ddf59a3772fd58e5ec81a8191bc790a4b4baacb719b447a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall detection indicate a malicious intent to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://duocthientam.com/uploads/ckfinder/files/97138518031.pdf In PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/73893030720.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210910235639.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c8c9dc44311dc9a709c798fa66fdccb8/letumuw.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f60ee990fdb276825f0dadf70e93af72/fuvulasajiz.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/kunuwebixizanene.pdfIn PDF document text
    • http://lawngo.net/fckfiles/86295833659.pdfIn PDF document text
    • https://preciseenergygroup.com/media/90529259977.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141127f66779---99661879005.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121711497076.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/mixesojatodu.pdfIn PDF document text
    • https://digireg.se/upload/tixijuvoketiz.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613257dbe737a---90272486543.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/rusuvaxipaxetosevizev.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/besekirupaledux.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/93476711032.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f5787af5---zefawinozuja.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df956382f5---40567210274.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/butasuruwibupakozoxum.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/76896152346.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/19149994610.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/turekezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+check+if+my+android+phone+is+unlockedPDF 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_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 17620 bytes
SHA-256: 94272e77d7c6c5788e0523e9f6301b8ad13f42e544d73616f2625b71aded2da3
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 11268 bytes
SHA-256: e4162e47fb45be2f2e2ee190393507d211aa22af2564f0b9cf49672a7daa5021

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