Malicious PDF — malware analysis report

Static analysis result for SHA-256 028f96a4ac7d5c4a…

MALICIOUS

PDF

95.0 KB Created: 2021-07-03 00:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c35fc4f9e8284be1e3ace080621340a SHA-1: 260e936506d3d5c6faae4db6528ae134f84e6d34 SHA-256: 028f96a4ac7d5c4a757ebcc0222cc8cce7d0c2c8083d2ad1bc6c2df358bf92ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be part of link farms hosted on disposable or compromised domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway security scanning. While no scripts were explicitly extracted, the presence of numerous URLs and the overall detection profile suggest the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=keylogger+detector+android PDF link annotation
    • http://work4shop.cz/userfiles/file/87570815143.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/lirapudozekiragimumizun.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/lusizikelosolalipenodevat.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/nugamurozolosijetafuwos.pdfIn PDF document text
    • https://afayl.com/userfiles/file/luzupaled.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/tigutona.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d277354c---bowajirikodezepabokowo.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/10162653309.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7bda6291891ad96738ffcc320b1f76fd/97917910283.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/pesuladalikixije.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/21292811269.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/im8kii8q7vne71fbf5k0scrmj7/ririgokunelefupimerote.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/fa1919085a2acdc9a9e3eada489cb2b0/18994020440.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/56560373248.pdfIn PDF document text
    • http://rld-carbon.ru/file/81456928404.pdfIn PDF document text
    • http://drironcat.com/images/file/povizogunebesimenot.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/mivodiberebiremu.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/fc344ed98beb0c957a457729f8a15ede/81124451022.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/retiginalebi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/86790694064.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/vipogebomejolubifiwe.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/e506h69i3each4dqg0rprshgnk/mivapejavezedudo.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aa647859fc3---jifazu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 10480 bytes
SHA-256: 32532adb639a4ba04908406e766b4b92be165b9d0f3771336aa852c8078e1035
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 22048 bytes
SHA-256: 00053cb793334f87c80a3491dec95768a75a63c3ec12a1330972642d4adde025
font_02_sfnt_off00012f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7E 12836 bytes
SHA-256: 92a601d17ce18bf2f86b397d164102e7ada626cd8d08713a2a0f47018d0a52f0
font_03_sfnt_off00015664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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