Malicious PDF — malware analysis report

Static analysis result for SHA-256 00261ce2b38bbac1…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 22:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47da94864ade5f815ab79949c190935f SHA-1: f38270b7154b3c908f54b1eab268fe7202574347 SHA-256: 00261ce2b38bbac1095a3cd3520fdb1eae07a352634d748058b24f51883e0c51
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads. No scripts were extracted, but the overall structure suggests a malicious document intended to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=native+instruments+reaktor+blocks+manual PDF link annotation
    • http://brmhn.com/userfiles/file/20210618045829_aenlwg.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/legosarewonanuzuvumokera.pdfIn PDF document text
    • https://ags-car.com/upload/files/matutetefataxi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119a1f2af0a0---xoravologovowivovibegok.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/67922298688.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/kesudodafuvogofe.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb0d067ea---zivujopomusexerasulawe.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0d9886c50ecd9d34ed2b40da89ec0e19/lanejenoromodumotuju.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a787ce0339c---lusetesegesatigasoseru.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5768be3c---fatuvolumaxa.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/tuxopumuwo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a62b5863c---22371598987.pdfIn PDF document text
    • https://reniuved.it/file/57734474088.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/koxazixu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/261acbdc7ead243ec517c8616aa45131/diruposopitoma.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/vizajonisubikazapapisadu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3a4272mvockn26c7v3f7teas5n/fawoliwoduvalopozebakiba.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/lidagizapodiguniso.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e51cb401cc5cff8633b25c0d813dd67e/83962886792.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/23t4gu3grb77hvttjnh8gm6lv3/nadegopexodevaf.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c339aff78---kijolifar.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/upqssr9ujavebqvi4r5g4k1kqe/kubisanazelubebete.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/60917818737.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_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 10768 bytes
SHA-256: ff05f253d6e9c68778a5b5e3027c32ecf31648e646966e00d057058fa35f3896
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 18740 bytes
SHA-256: 998072affaec5aac14cf037eaeab3609d7b73bad16aaa579e318adbb12f61d3e

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