Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce21801618626b3…

MALICIOUS

PDF

75.1 KB Created: 2021-08-06 18:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2cd9d794368eb7ef8ac18eaa1cda825 SHA-1: 797f48969bc2748155fc8b196172a42992b20360 SHA-256: 5ce21801618626b33ad5e528385b437051c4261f42f9e50a08bacc897a6013f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to websites hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple link farm heuristics reinforces the assessment that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16102c9817f2a7---47505996211.pdf In PDF document text
    • http://mashtalkandil.com/userfiles/file/jepizi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210616111036.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/33335498543.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160944348a805a---22135519883.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609042862a90c---14861070896.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d639b589ca---59750037160.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2f900e4a6dcd87dafe73fc22d05a020f/31842027694.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/31043762898.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5027b278e---lovazekefafojenos.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f65f5bcba90---mefajepesixu.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/c909b9eb09fd05f90f5f91ec92fb7af1/5780504891.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160892667d5c6b---wivug.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mqt4ci73j0lurkbbia12h9ue6f/volebijowulexorezu.pdfIn PDF document text
    • https://egca.fr/userfiles/file/18334587129.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/27384083849.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160faa1c8e93be---1436988118.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/89f8474d22c28c274d9917877297e5fd/87692707824.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/on33149asvl0c9p20u6tutu6b1/kogumef.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/94128709873.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075324ca1f52---85241464906.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vl464atii7f705nhv350ggkrm1/paxusu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/64967916449.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/66697012482.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837e8d854cf---24170907177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=animal+and+plant+cell+labeling+worksheet+answersPDF 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_off0000c415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC415 11260 bytes
SHA-256: 793b4cd8439eb8e4acf3e8ad5ee769fd1323689163ecc21e310d8b9a7bbb6bfd
font_01_sfnt_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 15336 bytes
SHA-256: fc4c3a8a76df5a14ff8a340166b709573bc471c669fdd31ae9a287dba29627ed
font_02_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1