Malicious PDF — malware analysis report

Static analysis result for SHA-256 de65828e929c93a4…

MALICIOUS

PDF

90.3 KB Created: 2021-08-24 13:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78e10ba1ca93f8e5d377bfe41c4f533a SHA-1: c9deab59b91823b2fecff505abf16ddefeb193ab SHA-256: de65828e929c93a4016d7ea78692e5d274f2139f49fabfa8cd3f3fab16c29fbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs pointing to compromised websites, suggesting it functions as a link farm to lure victims to malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights links to WordPress upload storage, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cructi.ru/uplcv?utm_term=if+only+definition PDF link annotation
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8301e7b82a2d83607b558fcc5a4cb944/fonujukuposiwodopilas.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67752e56c---84953742101.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/63026208800.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a7b12c203---fuzodenozatusejabev.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160837bb6af4fa---sosutijetosediniwujepi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b9b682e4e---pagug.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ebf7fb84---98118394279.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/73261055172.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/bawolibilijeki.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/domofedubepisiramaj.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/39062245768.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc25979e92---zurobuzemazibezave.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a38c8673---kinajoxijedumobava.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16108d70834a77---66464602537.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/sumitorulolodesegejuf.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8553boo43pipou98ckq5ba6eko/wavorujimakijeg.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a974f886b7---tudorulobo.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/55365009748.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/lanuxuzumakesav.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/baxivenasilebobanepe.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8d07c0e3---24595966505.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/54037471238.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/74263133788.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 10348 bytes
SHA-256: af89b69867414109db516042b72d54a5483365511b70484a470f4fa9332f3061
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 16656 bytes
SHA-256: 729945c1184170381c9124714b7e8cbb4e2445d93288ba5885917cce20530b4a
font_02_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 9984 bytes
SHA-256: 37cba74919125b8aa59a09725ea04a6c33f553ca80357f3aefed80a73a7515ca
font_03_sfnt_off00014353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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