Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd1463776f7cec7…

MALICIOUS

PDF

83.5 KB Created: 2021-06-25 21:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c35532ae6e939b7abc8d584e8bd7b3c9 SHA-1: 7365c8a525326eca24a19f0508eded93d77ae07f SHA-256: 8dd1463776f7cec7a1173ae86d97fc52ed1f6835bc607b8fbc0895b9234691d3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking user engagement with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=how+to+convert+html+page+to+pdf+using+javascript PDF link annotation
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b4330d500---91434471150.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/24396117102.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/befowo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859a50a73b9---56446851320.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/84895341790.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad22e692549---52774273877.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/ed867a79c5e04a794d06616a02ff56e9/84598454313.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0b5ce7d1a45d9420e8fd72fd7088ae7c/67070515121.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/fajodupomegujoronisipe.pdfIn PDF document text
    • http://planetamama.ru/files/file/gitelumivu.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/93412817408.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad37b734d5---tonaguga.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c2c337b168add4c98cdfebfb8dc306c7/25708961094.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbbe5142fc---43081507154.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/pasokeji.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/69217408086.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/90477185763.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/479cb69051d2678289143fc1ca55ae18/31683022593.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aio42qsl163c7jm5lt3fksnul4/nosizilokijaguzosadi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6726e4c0b---78670394542.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/suxulelidiz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f69fb4ee048d4daaf82541754451d44a/dododadafukexulosoko.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/a280710c61911870b400f9288d87ac17/wuderevoled.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964b390aeee---zuzak.pdfIn PDF document text
    • 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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 11440 bytes
SHA-256: 20f5acbbb996e88ad43bdca636ae7164e068b42eaca15a4cd422cd395a05033b
font_01_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 17832 bytes
SHA-256: 2d89652dc52247ff40a855b3254d2888c47e1618c30e818f8f84d01b6f0af9bd

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