Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d270c2321dc60e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 12:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b66b697fe49a0ca43f055d84518f324b SHA-1: c932d3cd17acd3957e9c3953423f4abdf1747ba8 SHA-256: 46d270c2321dc60e05da919cd0eb390f791943c6e9cb8432f139f9f6b37b33a7
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'clipboard command lure' heuristic, indicating it likely instructs the user to copy and paste commands into a shell. This is a common technique for downloading and executing secondary payloads. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a distribution infrastructure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://naszemotyle.natura2000.pl/imgturysta/files/53251713748.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/200746bf1afe8374547363947bddf170/87914204060.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d34db902---darizitetimunezava.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/jedep.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/4545790770.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/07a33246ca335455b76a6f06d5ee92b8/vugogegakaza.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210901064913554.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/17814881471.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/jidutenajulozajaw.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/85562989365.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/79209681301.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109030246138439.pdfIn PDF document text
    • https://agermag.ro/mm/file/17909623054.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/14267118927.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94b489a2e---45747488384.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210907185031900534n8agw.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/nadidefuverofuruja.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/83839769225.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332fc73c986---8073955507.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/monuramatasiwav.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/bilorezunisa.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tijewelebuzuwifatulori.pdfIn PDF document text
    • https://digireg.dk/upload/85015775425.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/wikuzozuvolubifumumaxe.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jaliximuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+twrpPDF 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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 9620 bytes
SHA-256: 465236901dc06cc42ea39c9816a8062384708b5e2e6b84faafcdda7b3c730185
font_01_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 17412 bytes
SHA-256: baa6fe7995a2ec432e7288172ab07b1a4866e43e76e4ca64e161b61f5c52537a

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