Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc65aff59e600e6e…

MALICIOUS

PDF

119.4 KB Created: 2021-08-15 21:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1a71b10436a382776efba9212894889 SHA-1: 2b32eb5d1d9ec8996b33fbb3334f653913fb17fe SHA-256: bc65aff59e600e6eafe01220155939be470637d2a4edc0d1525cf04ca0d93eba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5635b8abd6d61ab4987947ae40fa7e7a/23741765224.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8abfcfcaec2e82ad28362bc5a570dda8/16357032727.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/72q0koc16nm5atr8tsr6f3eso4/lujogazito.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/xekuxabaxora.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5a58d421---voduzevokurazorugofusivib.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1d8c343b---31571634834.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xipoxonuwatogani.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/tewulupatizuvisowelado.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/40646784438.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5523cd8a0a---87550264946.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88da3b630---xazojeviku.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f7f7fb2e---73788891314.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a5ac433bc39b5dbba5100721bfccdb35/61777552292.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/12271626305.pdfIn PDF document text
    • http://allasclub.com/campannas/file/ruxotidemagafomudoma.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/fekuvojolixar.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///finiwu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096a9853f622---75473078943.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161164a10e5b17---16105048484.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0880e5a11ee882d97d8ec3a80330082c/68976654207.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609badde98f5a---birekidugidemesota.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6858ee10c3---18377618274.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85a8c14f4---bamegow.pdfIn PDF document text
    • http://absigorta.com/E/file/zitoxalogowi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ktq1ft1dhlfaruo9mtm0jo0j8r/nafuvuzidujuxabababe.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210721072852918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fast+times+at+ridgemont+high+script+pdfPDF 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_off0001728d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728D 11000 bytes
SHA-256: 8cdb6c1823148e66f8372f50d317f8a27b83d41689534112c8c6128f5a9c9cbd
font_01_sfnt_off00018bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3BD 16704 bytes
SHA-256: 33ba9dbc0e75e4e1a6bd4359488f280ef9e485c5d453ec1404b99c9db39e616b

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