Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0084a5a08781a0a…

MALICIOUS

PDF

88.7 KB Created: 2021-08-17 15:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1e40a7f51ce63502dcca3012cec3d7f SHA-1: 1b7c53ce8c08d5a3cd0dddb2e54a1b1fc7ecacfe SHA-256: e0084a5a08781a0a73911661246d9535857b9d44470bdc6580cfd4c6dd644e18
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to host phishing content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc44f606c2---liviperesibazomagudil.pdf In PDF document text
    • https://cecprint.com/images/file/32489439066.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/nolule.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hmj0ubbafj51430ek6enk5oui1/jalolapejub.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/94660393699.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc102ef256---ragevemizegilod.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/62279905675.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2c7907a0c4927cec3e9a5edff9c7908c/85055198106.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/083050054b9dd1404ae574ff28fecad4/nadubasuv.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/wutozalipegen.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a844b5638f---tepudepakemazako.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1623177861.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/koguvezikitukideretit.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/paxotetededovazusegebuvad.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1b30b0ed24706e33ff6b50fc7875dd4b/67453307408.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c08ce75ef02007aeedccc803c423d6d0/21816927896.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1c9142550c6ad30bb755e3065438004/kimebepisurapifofovirazi.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210813_165614.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d397d2d4079edfe58307c3f2ad243f7b/sogifolikibuvepirumofe.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/17446686285.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/79741107557.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160996e3c58f33---xiguxakamoruwunesokobu.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/zevulenososivev.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/tomoxikokogi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f375c82da92859520db9de5a6fa63215/jonugorizubafugokataw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+use+nuwave+brio+7.25+air+fryerPDF 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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 11028 bytes
SHA-256: 145b488259e4449734982fe9d2eb1b66a0f49d67be56645e473d0ccfd6c8acf0
font_01_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 17128 bytes
SHA-256: 0629ea7aa9ea5837380fb9582bfa23a23b19ecc8bcbb56a258d0f92e59f4276c
font_02_sfnt_off00013b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1