Malicious PDF — malware analysis report

Static analysis result for SHA-256 0456b1e18cbaf24d…

MALICIOUS

PDF

89.1 KB Created: 2021-07-24 21:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77069e94ee7305227902c24e9339dd57 SHA-1: 5137f76be8848d062a0677231af249a6eb477e20 SHA-256: 0456b1e18cbaf24daf671b08242dd4a91c293e42cd40a1440578a7334dfa4ff9
156 Risk Score

Malware Insights

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

The PDF document contains a link farm heuristic, indicating it directs users to multiple external websites. Several of these URLs point to compromised CMS upload directories or disposable hosting, suggesting a malicious intent to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://mbzl-pro.xyz/web/img/podborky/files/57988455920.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ciu3mp77m33ifpf2m55tk548mj/ruxonuposol.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3021181d---gujakonejovi.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/18063878787.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/fcff6c2aeb38c628c57d331e5aca20a1/99182064003.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wamixe.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/dd201cf8a686327f38aa859e73bd1cd3/rawenefusi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/11d6737b74c15baf8a7755254e7e128f/vagosir.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/28904060624.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087951ecf519---dosig.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-19/20210619172005665153.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/456b1704d156a97eb43248d31d482570/42205260955.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/93379346142.pdfIn PDF document text
    • http://cloverdiamond.com/file/kibebivadexokuve.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/52562151011.pdfIn PDF document text
    • http://com123.vn/uploads/file/74858210112.pdfIn PDF document text
    • http://teifsepahan.com/files/file/44711723090.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/gedevutagubegin.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/wuzizuwebix.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/37269998151.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6757fab6432dd5f29d958a850853c23b/84469842283.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c8517c5a1---vovafexipafewagepokox.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/sizijuxenawojipakevozeben.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160775e83968d0---lupomiwagazopijewikoki.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/gixowujinesogawefelite.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/toxelibatujapisubido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gis+geographic+information+system+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 11172 bytes
SHA-256: b393831cef546da69a46e7aa7db4d149e3227a198f20cd698157809145d12173
font_01_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 17700 bytes
SHA-256: b724847bec9718e0606198740040dd67488735c0ed83feecc8af13359107f361

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