Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac9db2f153ec3ee…

MALICIOUS

PDF

113.5 KB Created: 2021-06-30 20:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ed7f04de0acebd2752704ee7b0b3182 SHA-1: 144c1177f119113b4082c9c5b46516f480924ad8 SHA-256: 6ac9db2f153ec3ee08bbfe91de79a94d78044f7c5e8e8e0afe51c152e045b78e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised WordPress sites, that appear to be part of a link farm designed to redirect users to potentially malicious content, possibly disguised as software downloads. The presence of multiple compromised CMS upload links and disposable hosting suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

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 https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160876e12aeaca---49971865547.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56439a5514---walabemovete.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/5552921188.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0721499001623887134.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/62476829668.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160965ec425c1b---54459037467.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1eba0f287---gesobepalirokuvi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb76523e8---potavuv.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9edf22a46---tuvepifo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41db950e3---49122060208.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/124dd8a84628ba5678e983af33abfd29/jazuganib.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/37322165677.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/vroepr7bquqfregh8i1rpvh9dt/jafasa.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c20ff8c490---52380499933.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6167071dd---labogexagos.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c66d1732f---90110383792.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3e93501007dce612dec0c97a5dfe947d/jutudojawo.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/mmj4rnur9hn2p11rr8qat8oo52/fexuzulanarapakuv.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/regedexodegavojezapi.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/mugoduve.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca85a7d8574---49625951549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=apk+openvpn+for+androidPDF 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_004_off00012771.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12771 18472 bytes
SHA-256: fe945f064372b26f0a30dadfde47cd72a38e4e343b6eefa004206446ba954150
font_00_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 20252 bytes
SHA-256: ec68b1d408172bc7b4731416facaa5eb5832ec7ddd6d604c7ce066b01830ceea
font_01_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14588 10320 bytes
SHA-256: 57ee6e0526fef2b8910bf28677cd4a8ac68df07c080d4bd6acacc07d735ae006
font_04_sfnt_off00015ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE7 33260 bytes
SHA-256: bb88e3689b9c75f12c852983f26e3a30990ed77e89c1876c646d314bd2ba4d09

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