Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f83ec9bdb94caa…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 22:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e8134c3f9fbcd991ccd9588d4140158 SHA-1: 77daf3ce61782655436dbb3793a1a52eb941eb7b SHA-256: 74f83ec9bdb94caaf0500f26ca0069fcb3f17c4ef9bed575eb8ebdb13570b07e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=a+to+z+letters+words PDF link annotation
    • http://lamorenj.com/userfiles/files/71810537769.pdfIn PDF document text
    • http://viorina-deko.com/images/file/nesegotosikajutofevanov.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/furozexutezuxikesapibim.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/37355799089.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/19256380921.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/52935756280.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d67727mu3bd869iu8rnobihr32/sinopalalanotex.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/jutaf.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/wobetoziw.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/598c68c26b075c7293aa62432f6460e8/giwopadikugawuponakotogox.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/95308421684.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210905_67F12F12DA040BCB.pdfIn PDF document text
    • http://seritour.com/rsm/files/jinevizivasuwadapuvoxub.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/tekudofitijapa.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/7611891024.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/tinisub.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/nigedodak.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210903_115156.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/vesopakazuleluranomumam.pdfIn PDF document text
    • http://ymmicro.com/files/files/jodilo.pdfIn PDF document text
    • https://angkalaris.com/contents/files/47694851682.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/zarokesudupul.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/48327122418.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161318102866b3---46558559341.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_off0000b5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 17352 bytes
SHA-256: 64b7035898280a9f73eacface81f7d0b1175944af5da21e421633ad24fc94e7a
font_01_sfnt_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 10012 bytes
SHA-256: 91171500ad23b9c6c9c34b4939c7910b83c7a0325463bb259e94e1d26f096337
font_02_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1