Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1de3cf31372756…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 01:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4de25ed3c30a8c277fb2c23fb311ce68 SHA-1: 3efdba80873f31f982ec36d8fb1f728a58e720b8 SHA-256: bc1de3cf31372756c20d76f63b9d5cb42343537359b2866bfc0010f1aed6ea41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://shibbirs.com/media/files/9442172136.pdf In PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0aa48101---tarepelebinozomapuwoxuse.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/tasarobo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608734f2930a2---bemezem.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/96325360749.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/19177093629.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/g68876ltg1bmilfi2hu2fkis6q/39773650013.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795436b3233---dijaxonapajokitubepaxo.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-16/20210816235808845275.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/331000693.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/dogaf.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e3b793fe2e7d40c7c4042a920eb6c2fd/rarofimurofunalawen.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210804070912.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3d862afd6181561d578a46401994d34e/23511811791.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/24240127537.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/7326367493.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jizazajuxerun.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/fuzozujofapos.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/zuzekusawamuxixoxepalamu.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/kowemapezorukuvebivetisiz.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/lusaxude.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/11702198852.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ae6272d433d947ab230afba0be69cea7/97588966148.pdfIn PDF document text
    • https://hsse.cl/files/86393610795.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/lotisawuw.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hckve8fu3thufmlo5t85e7jn47/51009214715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+open+up+an+xbox+controllerPDF 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_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 17484 bytes
SHA-256: 8d4ea8036db50b94af94d8bacb31eb0ad4b90e38e63231aced43343d113981cf
font_01_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 10528 bytes
SHA-256: 48b80bb5a754df5f8a571d33d0566a4fe3811336c7f91f9216d9d9e3e0432082
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1