Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79c559c9b1b82f6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 15:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39c28b466619c95c522237747e369d4f SHA-1: e0ff39f57bb4f17f3e61401138e6bc5dfda67625 SHA-256: a79c559c9b1b82f61244daf06ef12012ea09e4e838c2767839f59d7e08322764
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=shadow+fight+2+cracked+apk PDF link annotation
    • http://absolutelyneon.com/userfiles/file/12861271410.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/81846558964.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/sadit.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/40475080481.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/10089747294.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/parejixupijosoxoweke.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/gixujunabesuleb.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396aaba6433---16914807943.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/getekizutalarowejov.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f3beb5fd9370c6f665de68f1dd3eee1b/14041838798.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/9987787589.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/lowiwoxururupi.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/sufipogadofejizebefivanu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3168d66c6d8cf23ce0c2ac46ce4b30a6/finujibagaju.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/xanixegibafiwuve.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/jufixodukagov.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca94bae3f7---loxuvavofulebavolami.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402176e9570---9868650304.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/gedatufebakubazawozasak.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/wakinojefisogopiwoge.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff6055ab2---53663144971.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/71414741569.pdfIn PDF document text
    • http://ministerium.pt/files/18391636362.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/061121426357.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0477c87fc---90657456597.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/33347517188.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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 10956 bytes
SHA-256: 8ba48734115aa262cb6b6798414e7b849113e09a59229d598fed496805f85a27
font_01_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 17572 bytes
SHA-256: 0ec3568c061c406dae598061bd1a29a8ef7fd0ca024ab448cc0c817268444aea
font_02_sfnt_off0001207b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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