Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f516a4014576cc0…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 05:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 10414ccc394f5a91a2e51b60a5bba9d6 SHA-1: 7f7b513fa07c7b16e4a65a2560168804da8d1654 SHA-256: 9f516a4014576cc0367af2927573e7c011bcc0d40e0463cfa18cc607a39494e9
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_SECURITY_BYPASS' suggests the document may also instruct users to disable security software, further increasing its malicious intent. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://mobilesamara.com/img/files/file/75781357458.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/kivova.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/30tu1rojtonfci6f94nnl95fcs/riwizolozim.pdfIn PDF document text
    • http://888chji.com/userfiles/files/8462076109.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/16912300203.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/juzefe.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/4449383427.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/16613159378.pdfIn PDF document text
    • https://olterus.com/contents/files/titazuzelosozoximinabimen.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fs1g39791qi8ll124u2tu6uqpi/fitazo.pdfIn PDF document text
    • https://ccskin.com/geektic/files/bisigidamaduzalezuxegifif.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/cdca56155e40a06972eb1d67e7c8bd5e/tupijapitumoserujuzati.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/nivope.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/79423931153.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/baguniporegezoja.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/janarewimefogitugeputez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161519645531d5---xuvegevuje.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/womat.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/risenajevufeboxaxitatonul.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/vegogitegobopolomutipure.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/xezemen.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/mugafadajejemavetev.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/87048475036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rain+app+apkPDF 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 14760 bytes
SHA-256: 776cc6013df462859d71abe84d6ff1f7cf9b9dbb1f991f25e1ef58b44f91a4d8
font_02_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 9720 bytes
SHA-256: 8eda8e8e0ceb1f6bb8eb9b5b6b6c6fd4be529bb2927032d39c8c024e8b1da04d

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