Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d945358cc5c10b1…

MALICIOUS

PDF

87.8 KB Created: 2021-07-21 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0fc0e92438694ed5d79b681514b01d2 SHA-1: daee1a8fea421f4521006c98a3b9391efb7e1227 SHA-256: 3d945358cc5c10b1c324560ec5611298d612459a947571da069ad64d8ec1ad5a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://jump360.co/upload/files/20210621232344.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/953320eead931dcd095e429bfc912677/wiseponinurusikubolepo.pdf
    • http://stroi-sistema.ru/img/wesagigupupepoxonal.pdf
    • https://pet-fashion.ro/mm/file/punexopitadojip.pdf
    • http://aokisuper.com/ckfinder/userfiles/files/zomarodiremimojisexibubot.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dd8f7e06c---6520944787.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2155a51d---45427030034.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2e9b4eb8c56c7fa01484d6c5decb4fc3/16260574605.pdf
    • http://ownlines.com/upfiles/file/37907604291.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fk2ku4di4o8prvembk3dnebar4/39803418189.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08bd923e5---lelinox.pdf
    • https://lescourailleurs.com/upload/editor/file/2098099875.pdf
    • http://semut73.com/contents//files/jelofexujezuvirazuwapel.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/pakaf.pdf
    • http://jadever.vn/Images_upload/files/nusuw.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6soalbf12jn1es7clodm3rgpou/legun.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2eaa8f8d4f9ddcc3bf1ebb61f753eeef/pemojekizuwasefitevasafi.pdf
    • http://jandenzobv.com/image_uploads/file/davuneguzuxakivelezukaz.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609815bef0b25---wimurozoniredis.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nrdm5gbgnu929vjqvttuoiorrc/duripupoxetuz.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/uk1ibelkiaiqh76ib2hcl9tlm0/4064810998.pdf
    • http://pamat.ro/UserFiles/file/webobemozoredomanaro.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb94adc0a5---98117178673.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+throw+a+spiral+pass
    • 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_off0000f67e.bin
35caa25b0f658514549db1a55e9e3a0177e4ac00a149cbf3727808dff354afe0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 17108 bytes
font_01_sfnt_off00012308.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 16792 bytes
font_02_sfnt_off00013b1f.bin
3f43c54466099604eda9c08ae5c3ce8808b061fb93ba48659ac2cbb0d6fa241a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 10188 bytes