Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8cd15f7d4edeeb…

MALICIOUS

PDF

83.9 KB Created: 2021-06-26 00:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aaf31a7b2a73995674a6ab79e4a99a6 SHA-1: 9d89bf5008fc0756f77290132a47f534d2469abd SHA-256: 9f8cd15f7d4edeeb34c93d5f4d135e2473492cf517220d81159c62cc78435405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c184514217---lilijirodepubuxexigofi.pdf
    • http://murasakijr.com/uploads/files/33326201903.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6371a59a---xivitimiwikeba.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab138d14fea---56626988267.pdf
    • http://usmleworkout.com/files/file/vedegigajofiwi.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/dff3e881c5fddcc88a74821b89066347/86447647009.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/sefegibuwuzuxuxesokapuke.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b130a12f5c4a76b2cbb86caf5b9d7cdc/somobivovu.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e5d9rrus5f8363pp4jsobquvl2/44148129472.pdf
    • http://libertyquad72.fr/userfiles/file/dagalikararela.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/lukudesifasugewuwofilupi.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bdd9ccd46---54564288527.pdf
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/devuserexizefomo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25822db1e5---pufofo.pdf
    • http://polyalpan.hu/_user/file/liwilubor.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/70ac56ffd3d393f404ad931485738bcd/nuniwafoked.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/925eccd54389757d961200b2819e92f4/wiwijusi.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9cae1410c01006be655fdfd2600f8254/19119445344.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773d24c397b---donixawuf.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7d7c1e8311ec916baab3b178a804e8c6/rugasakikapinib.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/lufumozodejemesovowago.pdf
    • http://fixafilm.se/userfiles/file/20392831429.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7a20479dd84413462c8e663ef60bb290/paxulurupebol.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910ef152114---78504984188.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160700bc21372a---55847284618.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=middle+earth+shadow+of+war+achievement+guide
    • 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_off0000e5f4.bin
625d5356701ab501ce29a2f04fa11ddb4187164e9ccb0e31c6d2d2ab275be92c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 16336 bytes
font_01_sfnt_off0001105a.bin
0f3cf4d9914c93175625666fe29a50897e2c830b1e288ac86de4fa5c2480f285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 11168 bytes
font_02_sfnt_off00012a21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes

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