Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b465749d4c828b3…

MALICIOUS

PDF

103.7 KB Created: 2021-07-03 06:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42273b3e2f7dfbf0873f05639a2d6b08 SHA-1: 6cf2695f246b1556782024ff4b00c48da3008735 SHA-256: 7b465749d4c828b319f698cc6dd42a56d884774d4608070122a4c00eb86e5fab
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. The presence of numerous links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/660a865150f0ebc82b59e6591ceeeec0/jufixinibewetofawimed.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6be58bd32---vemomoxejomesomole.pdf
    • https://holocaustresearch.pl/nowy/photo/file/80159491311.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13875e2c1e---9128161255.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7q7ait4ebuf6g55qvo66ra6erk/burovubanusujive.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfd3b56d5---botuxelaxupanedazowudefoz.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a17367189---zegiv.pdf
    • https://cengilli.com/icerik_images/file/tezapakaxubokerexi.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/00f165f13bdc01be643e06cdfb9d6dab/nelibaluwej.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/jnllenoge8m59gpm2537b9tgq6/37582678469.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/67725419597.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/56b4f19ef2202565cdc6e18bc517f127/vizurunoj.pdf
    • http://robbes.nl/media/files/54367018637.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce71730fd8---miliresifuji.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hfkpgfu60o2sfsqfchcuv2t8gq/21778461957.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d7bb3256aba61b056f0c1a86e58574f2/gogofipemele.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/91899808695.pdf
    • https://jetaime-shop.com/files/72340039018.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4fb9f114da982504d4e81b1ecc6c14bc/77253009958.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160763491561e4---sakoxolunavakurimi.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a245980c0---16122207057.pdf
    • http://beachfirebrands.com/userfiles/file/35748087085.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/sufivonizusulufatadebigan.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab785f8ed47---35881886103.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=craft+of+preaching
    • 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_off000135f1.bin
9f2f3b2db7f7a0fbf4f4afba6df26e3f4e57e696a6955fe77b84c9a3a3fb89ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 17188 bytes
font_01_sfnt_off00016278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16278 16792 bytes
font_02_sfnt_off00017a8f.bin
ec1e33b18622501d21dc8b39744951ff2e3d2db932f78008cbc44d487766729a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8F 10576 bytes

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