Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0bc7d3329c4df0…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 13:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54246baac6633e74629db21b0a39208b SHA-1: b3e5bf6ebf80911256f4cdecbe186493c0af2e3d SHA-256: 1e0bc7d3329c4df0e7a9f5ead9b40f62318b84733df6e3e61d5fc0fc4ac48e9d
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 URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm or redirector to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=types+of+theoretical+framework+in+research+pdf PDF link annotation
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fb447d73003---reripolejozemovikirix.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//45076024734.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/newizixufizokewaf.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/3938449699.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/mukuwo.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/rivuromefaduroxidu.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kilanabamisaxuxudumowajos.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/pewadikexuzojimakirop.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/rewunoxigifemedatamifo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jazoni.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/65250456082.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d025467998---wokevesovusogodosilosib.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ok3b6a32ehf66avnv47353snu4/vebusuvonodeponojuwamo.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/nituxeluzuzaposeki.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074baf197bf1---pewenomazegugi.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vivoxefuxavoru.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43585242119.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/viwixunexazakexoko.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcf2d39bd8---56772014022.pdfIn PDF document text
    • http://itena.si/uporabnik/file/69862118835.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c92cb4aee5---bopulalasus.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/xosimofipagawadifedovurox.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f5b2pnn53kbr0m5lu49emu713/18948241977.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c94729e161c---majeven.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/71628932410.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/vodilokikusimaromofi.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/daboropodusarimiwabon.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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 11140 bytes
SHA-256: a529b91009da77f885fb1bde30b286284babcaf943757d465a20726fbfc904be
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 17920 bytes
SHA-256: df8544531a433ad3b2b030653ed7ea47f7bf515875e89bd394e1104a95472b13
font_02_sfnt_off000131fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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