Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1af22e3ed1c15c8…

MALICIOUS

PDF

65.6 KB Created: 2021-09-25 08:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbe5d4170574b18a79f9503eafed541d SHA-1: 6dd907ee73c8e63573ab793243f1046d8f77941a SHA-256: e1af22e3ed1c15c89306eed5312e3f3c804faef033bfebd065b9ed2cbb8f984e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7101

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://ketchas.ru/uplcv?utm_term=dsm+5+spanish+pdf PDF link annotation
    • http://gorod-r.com/userfiles/file/xupipapodato.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210914_7CC79612DFFD496A.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fe3892f67e719fb84218a04afbb75415/dowivukejazebunefegetine.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161447afd99ae9---8679200389.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/41654023211.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///80060003336.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/penasomumasis.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71752823885.pdfIn PDF document text
    • https://cape-electronics.com/media/file/felupibafawivaki.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/gadipaletanugis.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/79388096050.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/54786918102.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/valuvelogusamifiw.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/botamedepulelibakinefiwun.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/zilipawatam.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5125a943---subolupixareg.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/77731644253.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/gifafunadugilazudelage.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c41c33806---kiralovusigalajevexuwenu.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/batibuxaviwofemilavazivud.pdfIn 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_off0000abd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD8 10400 bytes
SHA-256: ee454c670d6d434be2dbc628e8e3dbf8040f6d37518053f20d818741418f5fa1
font_01_sfnt_off0000c323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC323 15072 bytes
SHA-256: b78da1c50739f45fb089e41e2fe54a046e6bc6d00c2c2d1c65c4eb2e091f04d6
font_02_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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