Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b718a598c77f7ca…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 02:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a402409b122b962812de45191ad4a14 SHA-1: 4332124ad62abcc525ec25a26e406ef35d61cad9 SHA-256: 4b718a598c77f7ca17ae2bf643a18fae9b17adbd73430881b20750f0595bce9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=bpi+personal+loan+application+form+pdf PDF link annotation
    • http://slsnn.ru/content/file/xobaxewexamijukofax.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a318ba53cf6---pifilosukazutopogib.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecdcbb097d---61417123143.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/nulakavuxikisevidomon.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099d07483183---98192130641.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/sijorufemupinoporelu.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/puzufetepejekar.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lodawukewa.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a21441df6b7---fawusigevilokalusazuruxab.pdfIn PDF document text
    • https://wecareprogram.org/images/file/70792615225.pdfIn PDF document text
    • https://jetaime-shop.com/files/lejabafededifuxovoxerivu.pdfIn PDF document text
    • http://fedime.org/imagenes/lowupanidebobovezole.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/rumuwetinamunowenegu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9dd6e35432bd231e58f2cef5880cfd06/giwarud.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/30205608039.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b4d43a1e---44692090393.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/87879286606.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2e43ef8d---7880539445.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5668b5d16---buvovo.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/gulavofitogireros.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/lubaxibes.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebb3d84b4---72106850827.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/1tdau0keg6kj2ctucdqkltim4f/temokiwapejanesif.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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10832 bytes
SHA-256: b16c7097e568fdbe5f74a82aedf9f8e1a7fe625877ccc29186e073cd83a75400
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 17024 bytes
SHA-256: 7631067b69f4d8052b9fb5ab3483e99a7e85ced576f6dc90736a7009f10d902e

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