Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd22bc7fc4bfc45…

MALICIOUS

PDF

104.7 KB Created: 2021-07-28 08:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 33739bc3ba74bc2ce1c365e8739ca781 SHA-1: 69fb5ebcec4e026c15cf7d50a0671f6dc41df915 SHA-256: abd22bc7fc4bfc45099deada886f67634a513d82840d34c1d809a7516b86cc8e
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 5

  • 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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607186aa9fc50---ruxoz.pdf In PDF document text
    • https://bczenekar.hu/files/file/48151608504.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3794f71b---zunozipemebamufoniw.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/sesanalari.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67b900df2---93766271844.pdfIn PDF document text
    • http://yepuco.com/uploads/files/wiliko.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/13781614396.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/pamotanupexe.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/45906158762.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/wobixapesigar.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/65d8063f230af3c6ec6bed14ec28e2f3/52741401382.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608078d1a2b5c---17151700715.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/85206854455.pdfIn PDF document text
    • https://hirurgija.me//files/dizibibasuku.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a71727ce466b12227ed39570db09176f/susupowes.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2e7ca3c6c---96580561893.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vikadurifixugubez.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/hsgni4qbcspfrvoau0hqisia24/40358386248.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/lalukejokij.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d27ec855c---sibovawativusegegix.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132804228f---58000808443.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/mufibawopomikaxunoguz.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/64662206674.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/bedadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=full+version+muslim+pro+premium+mod+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f7e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF7E9 26552 bytes
SHA-256: d70109ea6891ad0a617b3af1ec794dc3311373413a395b5aba2d28f443992771
font_01_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 10688 bytes
SHA-256: 1fc66f5186fcaa3c76cc97e0489d61afe0e5f069b6242629d612250b5814827d
font_02_sfnt_off0001408a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408A 18860 bytes
SHA-256: 393426dbd14d197a487ace8f8b738272fc04a427eb16d3b1cf795ac0cea46b31
font_03_sfnt_off00017059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17059 2688 bytes
SHA-256: 9a130951a291cd9bb0a397a879fce5fc13faa3b3cc1a31c8f2c143422cdccccc
font_04_sfnt_off00017b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1