Malicious PDF — malware analysis report

Static analysis result for SHA-256 8216fd84e081b097…

MALICIOUS

PDF

94.4 KB Created: 2021-07-25 14:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fdf6f802c4c02e6a78e9d8eb7f77bd5f SHA-1: 1b2c19f29dc552100459ee1235d3b9728ebc6ed2 SHA-256: 8216fd84e081b09783232c6580da03f4eaccdaae7ac9ad11668ac1695c39da5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution, as indicated by the ClamAV detection and ML classifier flagging it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users into downloading further malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c528a27809f---44123835573.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a82290c0---busevuxirozifuz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8v76ua1boksn0d7dpdqasuo0n6/75933911510.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/kowoxerikobeki.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2f5b5709db0e739417eca2612d5185ce/52591361903.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/10764625235.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd46a073f3---29875092460.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/butat.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae74e429b02---nufetepinusu.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/19522811666.pdfIn PDF document text
    • https://areicon.com/images/file/maxinuxetuwi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5a301ce1c---3264640646.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/imfjc9eu5e1f7hnbt54pgdb34p/relobu.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/51244020690.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaafd851d7---79457196172.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/76678601953.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/betebeku.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/3111141355.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/kotorupasoni.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/memafikivaxojukalapiwoji.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0920b26650d2e00e3aea2783e50aff04/48685069381.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4476538b---31133235894.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddfb739e7---nimamerese.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/48300540237.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/28263027041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mini+militia+hack+android+apk+downloadPDF 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_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 10648 bytes
SHA-256: 37a149b6e1e015a6f925fb636ea24078fd078db2f0c8982053b2ba1562a20a69
font_02_sfnt_off00013c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C79 17500 bytes
SHA-256: 0ebbc36e66aff883f24a35d4b69a7b573fc6bd4a33982e6f3244857a826376de

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