Malicious PDF — malware analysis report

Static analysis result for SHA-256 605906ac184d654e…

MALICIOUS

PDF

109.9 KB Created: 2021-09-13 03:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f77b96cad38bd40f74b6c77fe801dff SHA-1: 7026f5d471e6e52d4deb984b175b1003b651ce45 SHA-256: 605906ac184d654e093396b9d2aac5c79ea48bf0147e243a2c1fcd3c4a619ff0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms. The embedded JavaScript is likely used to redirect the user to malicious sites, and the link farm further facilitates this by providing numerous entry points. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier clean score 0.2301

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.gamylai.vn/uploads/files/78984203820.pdf In PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/16940162148.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90adbbba4---weluzajuxunegefebelafe.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/11061995369.pdfIn PDF document text
    • http://espwireless.net/uploads/file/zixiwona.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b842dc5f1---wisaxebopef.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kasapi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f63c63748---pokupexogikegozumimodinim.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/96620016624.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/78425353996.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/bodebupuranuxum.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/jiwutog.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/givejowejinazanojowinin.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/12884205065.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/jizezinas.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/41966143072.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/xiwedixakekivesonowut.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/gixadiwudevetisisajifosug.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/10517184320.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pejebam.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/kebigikikexiwu.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wusevemavavofidafepiwuso.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/9943508056.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/74861e98bf5ee29c1acd4d6b1d4f176e/16425849598.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/26784049918.pdfIn PDF document text
    • http://wsm.hk/images/files/zalovezufivodudozipozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=words+that+starts+with+the+letter+mPDF link annotation
    • 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_off00015769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15769 10488 bytes
SHA-256: 48d818f42a3a03b0d56fb2fb95181174b4875bb7b2f8f0ff3fe69795a9cc9539
font_01_sfnt_off00016f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18760 17932 bytes
SHA-256: b186613156871e354e1a75e8a7d4d8c59f38383ee3ebc403d508fa71ecc8a68e