Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2831257b8633a02…

MALICIOUS

PDF

89.0 KB Created: 2021-07-27 03:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22060273f7e14d92df0b346ccbc33798 SHA-1: 3887974c9e242fc306490aae6379c10a5840dc11 SHA-256: a2831257b8633a0248ae0ca34a26004d7a5f64e17d3a0ea7c7d2253bd33aa4d7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is a PDF file that exhibits characteristics of a phishing lure, indicated by multiple links to potentially compromised websites and a high ML classifier score. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious commands or downloading second-stage payloads. The presence of numerous PDF links, some pointing to compromised CMS uploads, further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://giolog.biz/images/bulk_images/files/10400747855.pdf In PDF document text
    • http://dilimkebab.com/userfiles/file/wizeronezixonusatamedobo.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/nerurubodigogekap.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/bb65619b5b13e307e9eb336d46882062/40141060637.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160caded112ca2---87956040086.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f0e1c2ab151e6516c25f85a3f780b85b/mafemobobepudozulawa.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/pugadaweduvag.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/76328983688.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/13332840362.pdfIn PDF document text
    • https://longhoang.vn/upload/files/fonegabusatove.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c9170976---70006136064.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/begarukazagemat.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/gojifiji.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d31d23cf---34584298165.pdfIn PDF document text
    • http://heureka-cz.eu/files/17994210724.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/baxasirezetozijedoki.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f613848cdd9e169c24d385e747ab04d0/91192241681.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c00f7678df0r41c1052fsdlgr3/xofatifotadazev.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a946a1ed9---tevekexuwoto.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160823a8f29efb---77347869425.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9df722742---sapuwumomusamenutimulebes.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160969de46a722---zagimuxud.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/c13aq7o953j6o1g3ikh6s6ir71/zukokirusopex.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097843f71ebf---79013890661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+start+a+strike+solo+destiny+2PDF 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_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 10644 bytes
SHA-256: 33b0c8cab788786704347c59e70f2d67c574fde92dbf390514dfe2b692436b58
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 17308 bytes
SHA-256: a1634ed5d586c69e91f26c898791716d666de536346e1834997203f862c08e7c
font_02_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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