Malicious PDF — malware analysis report

Static analysis result for SHA-256 91251d4d4e394e99…

MALICIOUS

PDF

87.7 KB Created: 2021-07-19 14:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0690063fade68b73a4784eeee92f850 SHA-1: 7343dc3fdd2f86228fa7ce994125e9ae886c2d16 SHA-256: 91251d4d4e394e99a2a53ba7ba2032bbf828652619ee6219dbe84fda14102738
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to websites hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The document's structure and the nature of the linked sites align with tactics used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://akkoryazilim.com/userfiles/file/bisezutitewasefo.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac306ea40---dalezudumolox.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d08bc16ea---simatosoparesixufofoso.pdf
    • http://sam-global.info/files/file/80264842149.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2a341b266092f539b73996c407467693/4905845191.pdf
    • http://happyhanool.com/ckupload/files/58246639502.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/74md9su549p6r9m88foi205i54/minanuvurogivigiva.pdf
    • http://constantemail.com/userfiles/file/162648988562626091026.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/38895935842.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/cb4f5c37a71c463e47e6ea9bf8fbbf0b/15465671673.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b66d6987b---takadatupejuwidibuma.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k4k5r7v4pth8tijjp2bekimkd4/ripinijulotawawumigurelob.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/grib0ui2cia5ba9mmid6j5af1d/52488076210.pdf
    • https://advik.net/userfiles/file/resufarubesebaxo.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7775fd74de---31900981023.pdf
    • http://nuitsdartistes.eu/images/file/merejitebirizapuzimixumo.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d20cba9a---ratetanom.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fvd21uto1044c6ug65jne5t683/ranulaxixadilojekaga.pdf
    • http://rockpapersun.com/upload_mce_image/file/basigudegagane.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740710ee4f6---jelazikusodolekuzi.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7aed19f7---vamusaxiror.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608711944bbdd---wigaxumuvos.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955789d58f---kilakatakevifaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=old+school+steppin+music
    • 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_off0000f4f8.bin
f8021c62cfefc28d415b343f3dd6a62c488e1b28e13a1a99b2560a6942239ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 17036 bytes
font_01_sfnt_off00012183.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 16792 bytes
font_02_sfnt_off0001399a.bin
fe1d9d5892a0090e9a2e649d3bcfa1439ca0411ab0001e26d7e98b53b8cd63dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 10644 bytes

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