Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d82f72264ded8e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 23:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a53ac6e1c3986ef10c4bc54faada39d3 SHA-1: 4441f06573f8fbbe33bbbda2b8fe2ffb5714aff0 SHA-256: b3d82f72264ded8efb93110b6f8616527fc5c950252820f7987b34a9e74d491b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6346

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e1143352---75713624176.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7a13162c0c1ffba209d8b4a6501eca6a/17264278104.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed3b20fff6---86319378756.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/54135306084.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/magixudenolujos.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/mukegisomipodipo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/robubodezasefudo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/332481adbc1760e8e0770883f19f7a88/zowogesi.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/39792437607.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc99e4c23d2---82453447490.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/56918786705.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ad31db1a10b04f90760fa30fbfdfe763/59413196402.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/97947486144.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/loparisesakavuxibig.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/64112352148.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/vusewipa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pqm894h7mok3cc519ji6hrs74n/39498628346.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/88e598a6a86deda30604445ca98bae07/31263455716.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609492a12a3d8---dopem.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/19980995570.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/17fc6c56b5c02a95a2f52e86456b67bc/refevu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddb18a479c---11808428537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=weed+eater+excalibur+22+hedge+trimmer+manualPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/takideguruloruvaboromo.pdfIn 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_off0000c18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18C 15912 bytes
SHA-256: 869a92852f8688ef9498ef2c15a073519b0d267709f1cac026fb6e4a2dafe3b0
font_01_sfnt_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10984 bytes
SHA-256: 3d1b829cac5d7b3f863c74e3bae777c43206c5bfd946acf0aae63d259ed7222f

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