Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b213e9ec5cfd1c2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 18:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e5a16883308c357b5d5307669c299e9 SHA-1: 274db22b540775427687eafd92927272226d42a1 SHA-256: 1b213e9ec5cfd1c2cd5e28daa4a7487dba34ea12823892c6dec54f767f287c3a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=the+tailed+beast+naruto PDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6791909cc2---87062714503.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/jasoxikiwipem.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/27407966416.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/22335481630.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/54181996978.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f8df128c30f516c9ccab7c067e9ec8ff/57483256583.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1ee6526d---6325441653.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/837d52d7102b7958dd6b972fc61048b3/zuxunuzutuki.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/durelukikijolitosem.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mvuic96udmpkqeb6qjog874gfg/wewanapip.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/76662747934.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609647e54dfe9---romupowenomupi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161252041120d4---77596553779.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/53867566411.pdfIn PDF document text
    • https://triosms.com/userfiles/file/88506753706.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/3103713721.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1ae5563991df3d930d5d3a60f7031c64/34401535096.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5hosgu4bfh44re47r1j2mff6n5/41920964860.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/45927069276.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/gituguxe.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/balenosira.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/67781147689.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/81100292731.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/jenofuxarutu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/52ba9dba4d9cc91cbff440130e33e381/vigerumepevopazupuxeredu.pdfIn PDF document text
    • http://halaljones.com/uploads/files/gesebadepegawabekixusuza.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/pideviwizetivujekizat.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_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 10548 bytes
SHA-256: 0df39936a15a1c104262b5c8fbf60b62327ba0d0686eb2c8957a1fa0222f1cec
font_02_sfnt_off0001172c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 17904 bytes
SHA-256: 25e48228b86ef37af22eea5ef546f5c036a0feda670d3c0d28d29814a4eb8cc9

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