Malicious PDF — malware analysis report

Static analysis result for SHA-256 276ca67ba3d27613…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 23:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6476c51964554ed7642ed57b923eb8ca SHA-1: c96414f7b1d91247c74b2178d4d923e4de7f423c SHA-256: 276ca67ba3d2761367bbc5d6bedb1071e0df6a341516695be06f08624c3f0bc2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. This suggests the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://a1-automotivegroup.com/upload/files/jerope.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f667fa9a9e03425e164da79e7533fad6/3153097319.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/xavibetor.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/58387686158.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161111fbb456a0---sabonadijabumezatevudatud.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce842cdf048---91407323144.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/ripipevep.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/fodamojudog.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/41472776368.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/nefukiruga.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/25389957632.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3ffd61b3934c4a54304d02587912a076/20939200071.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kubawesarefif.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb49955eae---bidusutarumapupi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68241da13---xegafeforen.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1628074027.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/gipizegitisuvedotijazakon.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7v2ia75ejvf6bgl1no7gmoldfe/31770080846.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/74b434563406decf9d2b29dcb0ea041d/tedorinudasetojav.pdfIn PDF document text
    • http://effektfilm.de/files/file/fadonuverakesaziliwitij.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5b6f5d0ae---15853634711.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8aafcfb8a---nelamunizonixajime.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/18839570470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=emotion+face+coloring+pagePDF 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_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 16996 bytes
SHA-256: 2160ac4641d6278cf632442c06e67f96876996933de36758203fdf6ef42a657f
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 10640 bytes
SHA-256: af8033c59a808779ebed379badeeb603521d35a689db658292200878a69b9f97

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