Malicious PDF — malware analysis report

Static analysis result for SHA-256 20be44527bf21f54…

MALICIOUS

PDF

77.0 KB Created: 2021-08-23 18:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b70f318da82c9d1f702de84738006714 SHA-1: 3f3abc5065e3916e34c885016c9100f73d95fbc7 SHA-256: 20be44527bf21f5474438f8e542cb7c5a0fbe0d7e5f47aa15eb7ae4ebbb1bd65
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to direct users to malicious content or phishing sites. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://asupuro.com/user_data/image//file/zigov.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160edbccfb3ebc---16559225396.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gfo20acsuelsv723ikoqk9h2b0/xewazuvubifotude.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c13f41d66---tuvulebiradobugakumodetu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d33b5f958---satud.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/94664748034.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61aa3ebdea---melamalozafafi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gpnucj46cc14dnos8ujveal1h5/25356482346.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9b2d52646ba6705385911506a6b58731/fomupatavuretadukosozow.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0b22189c---95537017243.pdfIn PDF document text
    • http://bjjiffy.com/upload/jijaduvapawigisezop.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/ruwasufoguforif.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e31e46327---kexevorenete.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/71810238819.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608343804adaf---58363724757.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610080c2f239a---jupara.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/37083023379.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7fce1e45---67709899327.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/fesivemikomuzuruxiwi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ff579fe9---gatumabigelorufisuwonis.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/i5pvqbs10i6cimqrm69t9049t1/74245831553.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/85061391043.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/jizaxabunirafarenenak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rip+full+form+meaning+in+bengaliPDF 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_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 16356 bytes
SHA-256: 121f04c7b2da736931d48f9a11827d69b1debf1f126f3edffd65a67a4c985402
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 10720 bytes
SHA-256: d0c62e282aefc0dcaaed7d25f83937d41bd8f7b76ff7a6d1966772ab7addf04a
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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