Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4828024bf711f1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 03:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71efa86cdb854e75ddc6ab7b15429a18 SHA-1: 3179fb97fa9098727f828ed55bfc349084695fe8 SHA-256: 2a4828024bf711f11ff87f74ce2a3cfcc168352ce1ee55db33893aa495426515
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed 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 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rollfactorytogo.com/uploads/files/volofanumizesodixifizof.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3ff1bdbf5c76f4fdb043a53a8193fccb/nefutugudoru.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/1159333559.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/pofunijilojimiti.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b44f18cad---xokinalimevaxulumikonine.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e932eeda---44281107427.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/29361861653.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/luxibupo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/66696164581.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/25816456074.pdfIn PDF document text
    • https://matratva.in/userfiles/file/kosajimenuverepap.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/muposixemegova.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ee6b055cf62166aba924a0001b3abaaf/68435301769.pdfIn PDF document text
    • http://learningkey.org/userfiles/zuxibivegebapetu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1tjc036cfj2jh4tpcjcddacaqe/53694459252.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/savoregozimilemanetodajud.pdfIn PDF document text
    • https://mollis.rs//files/26480213927.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/67333525641.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/44368397213.pdfIn PDF document text
    • http://screen.by/images/file/ponetavetob.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078dddbe77e9---42750145174.pdfIn PDF document text
    • https://naves.cz/res/file/23667627625.pdfIn PDF document text
    • http://surtek.biz/image/files/20150225_153812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manual+book+accurate+5+deluxePDF 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_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 18880 bytes
SHA-256: 078e63f7f68414dd4117ef4a8f14564d1ca3487f7c112cb46146c46249ee4079
font_02_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 10664 bytes
SHA-256: 05f88c70fa1a54ec4d02e33321dd44613aa2c1972aed460c7f6209d53c64b226

Open this report in the interactive analyzer, or submit your own file for analysis.