Malicious PDF — malware analysis report

Static analysis result for SHA-256 75493f9d37e5a0d5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 03:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f49eb846a0cbf8cfdc94a560c516c323 SHA-1: 44961e45cf129b04d5a98a34f5575283b3714503 SHA-256: 75493f9d37e5a0d58b44a38030713ff0d3a852d30c93aae9608dfc9cf64db1bc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically flags links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/755d7530dcf69b5e49543fd341e61090/3409791078.pdf In PDF document text
    • http://akicgiyim.com/userfiles/file/sajorezimodadulebexoteza.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/jatafebuzifigivifoli.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b6255d00---55345034491.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1e8e298ab---ninemibatopudija.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/486de3f4ccd4033de26149b79501560d/23554114657.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d8295c1f0---98379686377.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/litovasowedu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c146abebb29---bamudijob.pdfIn PDF document text
    • https://renetravel.ro/images/files/82207632161.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210811024451_1702216087.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/giguvovitonewanibevapuva.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/rarurokudag.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/28850041076.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/rexolebilogekesu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0g3ci87clv0pp4m9icpuv0mcc0/29447677357.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/84676881597.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zaxomibarosavavor.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/87eg5622aomghu99nbtelbqph8/48078178146.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df999c5d97---wovimoga.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/26543060559.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f0d1dcbb---515470246.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021081922573643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apa+style+of+reference+writing+pdfPDF 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_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 17492 bytes
SHA-256: 1e4fbfd0030b79861b39629636263f2b80cf263517e4e0f6326d76358e8c027a
font_01_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 10976 bytes
SHA-256: 535da09b3d08519fea8573cf4bef8f9eb67eaeb4743f7c7aa851a57039f255bd
font_02_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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