Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c76811d1827bdb…

MALICIOUS

PDF

75.3 KB Created: 2021-07-27 07:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1db3f277806510e7fe8dbd1df54b925e SHA-1: abdc479f6b6f489b4adf42cf78ef0c7ac0188389 SHA-256: d9c76811d1827bdbf3e4a89cbedc73ffdca5123ca1f9db45d0e05831704dfc17
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The embedded URLs likely serve as a lure to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.rotudavid.com/ckfinder/userfiles/files/98918539383.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7819acf1aa---50791043198.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/tr47a0ls1safne1tclb9see5cb/tazugaserudozexir.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/gofepul.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3ef0b20a8054db6d1704caa4ccae5621/sufumokonod.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/59679533179.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/537a5f7920adce775fb7b7c7823b8bbc/13883437508.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/47454054272.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/sozepajigalizekuz.pdfIn PDF document text
    • http://bdn10.cz/files/file/63031686529.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/setofebitivekoworex.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2240b19a---mebedudomuwezam.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/2759208095.pdfIn PDF document text
    • http://myqself.com/upload/files/4864120837.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/76074521010.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/31337239514.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/efb5107da66847fbd640a3907436d565/xepukifofusig.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/n11i0kfv5d9r76d07pqshik0tv/35886300582.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdba04179b---36111612300.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/64448795696.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xunerirekeruwix.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/1151040689.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780980afe95---pipigipixodubitaregobilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=atlas+bradford+blanking+dimensionsPDF 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_off0000c25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 10912 bytes
SHA-256: 7164555fcb66ed553db276c55fbf1cbe2f752edefbb1c1bee175c9a9356a221f
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 16776 bytes
SHA-256: 214ddb64df72300647f3cdfae6e0dd3cf3d94266de192b1d9f0a5ca31026928f