Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3151a40301da2f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 23:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bcc060bac7effdd86771089ab490e25e SHA-1: 7511906012b098924cdbde9997d13f73aec65750 SHA-256: ca3151a40301da2f948ec06c3aee89b776e38add09d8da8f05a2846835a784f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://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_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