Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b8c48221351de2…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 12:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89f2940a675fe8eca9bdc8fc3ff682a7 SHA-1: f4495bfb7f2c511d19e69356542811c3d67d379c SHA-256: 95b8c48221351de2dc3297088a3a3b778135f42dcee9501a675979f73d97dc37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. No scripts were extracted, but the presence of many external URIs suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=auntie+fee+salmon+croquettes
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082392b60663---jumenopimekutudedukug.pdf
    • http://centrons.com/uploaded/file/79552003960d4dac436441.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210618_ACA4EA0914B861EB.pdf
    • http://hornets88.com/clients/56662/File/77144377775.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/eamqr61g6nfip3l5aqi5tt81li/22831184892.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a9f1fc76---3656067865.pdf
    • https://lawina-radom.pl/files/file/23669334797.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d7e1fe70adb55c9c3e72f2e5d03a8d72/39404214984.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5ede2e73---95494937687.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/50000342080.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e4db0692.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca4b4850a---11721111962.pdf
    • http://soldearenales.com/galeria/files/gutodiwukefuxatov.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084889c3f428---20259200445.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6ff8a068---gikininogubi.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/nnjmp4caj7j0s3f9q8hjm03ivj/zajabozedolemugopif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c1.bin
8c98578e377b3b486c56c8a3ce0e314eb0548c2d00ceb8f81e195c937f4679f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 17280 bytes
font_01_sfnt_off00011ea8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 16792 bytes
font_02_sfnt_off000136bf.bin
5e845fd4f76e97c8c382c2b0c12575a6dcb25706b685effb957b449ab910ad94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 10724 bytes

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