Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9ccad44128610c…

MALICIOUS

PDF

82.6 KB Created: 2021-10-08 04:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eae4f99186613337ae6d333adb3cc26e SHA-1: 4dca503553ba47b659a2b11c9dd465b508247d45 SHA-256: 3f9ccad44128610c3eb95349c2ca3ec5fd16c61a265741b951ecf3bfd1e577df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=gate+books+for+electronics+and+communication+pdf PDF link annotation
    • https://bravo-hk.com/userfiles/file/96963910554.pdfIn PDF document text
    • http://d-innovation.com/upload/files/ripivimoj.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210914/16315784339112.pdfIn PDF document text
    • http://ge-mak.com/files/wiwuxiwis.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/zuzufokoro.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cjt0suh30ip5m268ui7jo9bki8/73374273265.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/9138384618.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/wuxokunipuxomenizufufu.pdfIn PDF document text
    • http://jfe.hk/userfiles/rulurobuti.pdfIn PDF document text
    • http://stattus.com/assets/file/kabijeditoxibon.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/77748044320.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/42377884688.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/lodowuvoradiduwetubezanin.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/60cf39a246730b11aa991c0bb0d9574f/litesogofomobijufiloxuk.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/52631212783.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/toredebuburinirafag.pdfIn PDF document text
    • http://patchworkstudio.de/userfiles/file/penexisumifenugozipajixuj.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/6394900201.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/nopijogebisegopu.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/8997884405.pdfIn PDF document text
    • http://getdol.com/page_data/file/42382409520.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/95325503608.pdfIn PDF document text
    • https://akemi.ro/hirek/file/54538049117.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7bla4u300knsa15ct1cr2t3i25/29715932030.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/48453367964.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 18708 bytes
SHA-256: 7373b85fff4866df7fb6da0a1672fa73181533ecf12c3657ccd8e82798e056e4
font_01_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 11152 bytes
SHA-256: de5965b19015435cb5f564a4c07d0c8d294ada2024c857b4fb8a627d8ec8ebdd
font_02_sfnt_off000123da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1