Malicious PDF — malware analysis report

Static analysis result for SHA-256 917bece10f33a25d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 01:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a230ece76a528d83381f8c49c7302d08 SHA-1: c52d58e9ba0c451f7956a9dd7b866784d0cd9128 SHA-256: 917bece10f33a25d7f7227fb305de764ab9c373c0441f141e20e466637117079
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious payloads, potentially exploiting vulnerabilities in the user's PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223e19e5cf---gexipajogubogoxefar.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf3806e81---momasazadiku.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56456b72bab34b3ff3a665a65d783169/nimezubudikudokaf.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/070b0deb5ba60f28f6d525fc0fcb896f/detapakijezonasen.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/a640hh1lrq8sn8et0718pu135d/pofuzanodu.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cffc80966de---wubudiruduvox.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8196e7803---90056197760.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf294bcb2---82233909441.pdf
    • https://samngaimarble.com/html_upload/file/76192070657.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e323d11b---82702100283.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/hivfmor666tfkshl53sls5fe4t/wowafurelixedogekawan.pdf
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/sivof.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/33lvrq7mo1eh50fv567ukola80/74844625399.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/87837838611.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0881d299---37078202114.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852983178be---maxet.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cdc5ba1b5---todufel.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/feeba372abd6db018224ba5ca06dd003/59491365250.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mq03rspqa0qgr67b4v1bvfeu67/88547947151.pdf
    • http://kursadowicz.pl/Upload/file/kidamizaxobifumiwolupuwe.pdf
    • http://www.findvoters.com/userfiles/file/49051298730.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefad638e9---resigosopikupekebadirovom.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/261g57fap8l7pl9up78g0cm9ev/62550961710.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=compress+pdf+for+free
    • 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_off0000f2d9.bin
41d7a4e9d682a9679c3dc426c96ac361590cc1d4d92bfbb4e76f1df4fb05205d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 16776 bytes
font_01_sfnt_off00011e88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 16792 bytes
font_02_sfnt_off0001369f.bin
8db42f97fd6c697a55a0a05014f020daee69129d76a1b4b927601c61c248434d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1369F 10188 bytes

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