Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee510c62b82af2a…

MALICIOUS

PDF

86.0 KB Created: 2021-10-13 04:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 21ce9c9fc3b84efcf497f4fe7e5fbc26 SHA-1: b7596c5a2aedab4e5a03c525a2a50f50dbcbe52b SHA-256: 2ee510c62b82af2acc8eb418e0df536710e3c1f7b6c608aba3028723263318af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

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://orangcar.com/app/webroot/upload/files/junapogixulurogom.pdf In PDF document text
    • https://femagnet.com/upload/edu/article/file/kajibokoxewaw.pdfIn PDF document text
    • http://dgkno.cn/upload/99121688066.pdfIn PDF document text
    • http://zaiger.ru/img/file/rigetabekara.pdfIn PDF document text
    • http://weingut-suppan.at/files/fovupevodikiwaxorim.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/jejexi.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/84816067003.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/rujevokobebaloturolafevi.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/wumovipurofezojuxagemurip.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9dc1fb03bfcc3e91ea0fe0803f4ce974/lijibitotaxifata.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e5b5c66dc0a841e2d53a001a35881261/41617978029.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/86066677234.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/12284219533.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/devuwavoxepur.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/d865110a6ff2ea91116507e88cd5da2c/fimexopete.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d118019e40---wunedibosekop.pdfIn PDF document text
    • http://carbonelite.ru/file/zuravexovopeputupus.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152cfe14933b---68879841420.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/594289457.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/68277912718.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/424fb2662e8a1e2882b469ba80ad257c/pekukunaw.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sixiku.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/10782401354.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wiveguwud.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/kebetafek.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/25682374418.pdfIn PDF document text
    • http://elsped.hu/files/file/selekum.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e3eff936f0---girugudorevujupufotij.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=shorkie+growth+chartPDF link annotation
    • 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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 10444 bytes
SHA-256: 5af4e77141482f7775ae00457e83beb7e5ea0041d44785828049791c64681cd7
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 18328 bytes
SHA-256: 3ee07db252eb35ed5fb246b0d89e4d37556744b280e49f94fc8657c66639c80f

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