Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac32b72253d5d52d…

MALICIOUS

PDF

90.3 KB Created: 2021-07-16 22:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7f90e7f87b289314511eeea6b1f0e5e SHA-1: 9274621109b71756147c4062a8d857427d8c7102 SHA-256: ac32b72253d5d52ddb7f05986443f7ee09a35fbeb96846f005440b28d5a9a29a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://watertorens.nl/userfiles/file/dimufikitegipuzuwag.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/f7v9dmioljip4ris1i5a51kk42/kemexusodiwikop.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e4d17fe996d912bd0af650d70f420438/52474235025.pdfIn PDF document text
    • http://demkapi.com/resimler/files/41277207473.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/020234352368.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f22954d2644f4716bb6f1b03cd3009f9/rodibo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05b27d867---63679158612.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/85274723434.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/posozokasufobovi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce916f97d82---nonenodinusutazela.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ede3e63ecfc---zutiwikon.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/1c1resm2ddjbb3oiumfbrdvk8q/femamuk.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98b5de6f78---34546279919.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6f28ed5dd38638cf92dc62608d00f175/zovomalurazonimusa.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/38563145141.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/jagelobadadigugoru.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/suxemoben.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9ca95259---52785889662.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9312d331a9---62913078025.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c061cb296---32917970204.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/10094688469.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jehrhn17em10qnegcp5po0feuc/2041567241.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/divovosoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hiccups+all+dayPDF 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_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 10160 bytes
SHA-256: 158229a18626d55b9df90cdc6c7af76da39f601b355389ef2b6d6327a228ab74
font_02_sfnt_off00013210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13210 16364 bytes
SHA-256: 199488ed1a630f749d34c225b52173e4e03554cd0513bc09a9f044a972ac07d1

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