Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aa2a329fb30f08…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 17:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae2a7df9377bf36d611345b03c7ebc48 SHA-1: 0f97367791d611f6719266ab4db63df3b1b40811 SHA-256: d5aa2a329fb30f0841efd5a92a4e343164f6e91917da350aa757c5b0616f8ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be to lure users to these sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=microcontrolador+pic16f84+desarrollo+de+proyectos+3a+edicion+pdf PDF link annotation
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4tvc3s2mt1m3dgemcg9829uqaq/dudubegu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e0996648---mevoxeladipeweges.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5b71b7e0---sorupuluwemowujodukelitek.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/73179524198.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/fepavu.pdfIn PDF document text
    • http://drlanda.hu/user/file/mukimekozatazamutodew.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/961a34cd9705d733bb885322ce90642a/92896554427.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/tixovavipukisel.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/31106237820.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/24771908565.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/36273327273.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a504d03f---zovunel.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/wapuvi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f930296bf---55070106117.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/vefozofejezin.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/tudesimixobilupakimiwop.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a103545737dd5650f0ea84a99c2cdfa8/xanubukevu.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/ruruginisovekupigaw.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4f8nfcdi1i9eudipqd1ra0rovq/bevoxojivovelameb.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/xuxexawulitowowevunol.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/matevezepebotubajo.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/22535493030.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fed27cd84---18994049824.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/xadovagusokodipirodu.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_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 19428 bytes
SHA-256: 37d2733874c513d5be8288db0f738f639a59d7b3feeb7f980841bd3dc76e5e32
font_01_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 11400 bytes
SHA-256: c9fcbbc506085ceae2b569eda0f389929d9ed19331413597f8a3ca5443e5f9b2

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