Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29668cb2f1ca662…

MALICIOUS

PDF

82.2 KB Created: 2021-07-13 23:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 1ea2fa4198cedb45bcf4204bffb26d9c SHA-1: 13079ffbc9d1f0fc108414001e71c4a825cb219f SHA-256: a29668cb2f1ca6627c119ea0a89682a06128cfc30b27ab9029bc2ee3d02e1fdd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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 https://atcotourismtravel.com/userfiles/file/pereromuzuregi.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d9024b46---54701606743.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4d2e5e53568ebed678bfbaeab3c4932a/41643067689.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0620/08342f05af119d9d90d3f6729f663406.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210709_122613.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5055bc09c870fea546311d5af88f2309/sufunodo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4uhdob8sjrlej26k77tskhk2vf/87722554014.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/30237f1858991a7db950af7e0d71f2f1/saxikajonuxiloto.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/47985428754.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/93302236211.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/67169267907.pdfIn PDF document text
    • http://learningkey.org/userfiles/89889209319.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/98693637253.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cec49b9b029---2651859411.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/eb9ae630cf0be0a8d454cadfb4ac014b/ragetu.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/pojiso.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608851427d5b3---27382715517.pdfIn PDF document text
    • https://taperagi.com/contents//files/81897897459.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/23005151588.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/demajogurubukop.pdfIn PDF document text
    • https://primer-spb.ru/files/files/75158649211.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2a77ce2f732a1398e3ae560fe85d905e/73078004954.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c71b98a7c05---34715569537.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nasedakutokidagup.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9c1be192---19396310993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=virtual+villagers+origins+2+eventsPDF 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_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 10540 bytes
SHA-256: fd4681aeb5a2282c8a204ec18c28213fb22dda81c9bee2f23550fb1a28d196cf
font_02_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 17356 bytes
SHA-256: 542ef6d2d1cdf06bbc5168b9a38b369985ee623b9e10fd8ac3d488dbebfcfff8

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