Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e281a93eedcf4c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 14:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cbd527b17813ba2ee32cf6fe44e7f9c SHA-1: 3723f7ce246be7f8da84f21bbf9460425604acef SHA-256: e7e281a93eedcf4c3d1ac6a5a3ffa27d6ca89f934c7d1d30e69b81b0c198432e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=stuck+on+white+screen+with+apple+logo PDF link annotation
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f02bb21487adaf7fd12eac3556a7d3fe/47465487177.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/84946659751.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/liximax.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090407522749.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/tifazafov.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/tisudedepujatevadem.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138095f68abb---bajagogozexazujumefax.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/katanajarogijuzubasam.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/53179824791.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/31855704609.pdfIn PDF document text
    • https://primer-spb.ru/files/files/wakirotefaseso.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/jewutikixugajil.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/porar.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/64046546713.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/68815282562.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/71155540089.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/xutafozezotigopupowukixu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c3fb7cb3---76471273064.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/damobewufutuvogujif.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/55498844586.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2e93662e47f96fe518a537839b625ab/bewevozonejakenetudamet.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/38581129503.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/57440099959.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/koditapitutadidokeri.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/wulabusuku.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/lijuvuraxugunomuxek.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_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 17444 bytes
SHA-256: 2da1d7c1ba6a0b696f7599a32b7b0b785bd685684567e8ac942a175825df572d
font_01_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 11004 bytes
SHA-256: e1d1b216cbe8293570faf2b614501228f2170f74cca6f6613afed3fc99c9fbb4

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