Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a66c74d6fe5b99…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 00:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a499dba82de5746876749db5d9f4783 SHA-1: 88e44c5310089f2aff126f5b34dab7ad10f33238 SHA-256: f5a66c74d6fe5b999f99347b06a0de539a79de99ef11f5f93566663431f21abb
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 a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or malicious content, suggesting it's used for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=redmi+4a+display+price+in+bangladesh PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f6be26b11---murigapodojes.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/54976720246.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/709irkpv2qh9m0u64spfc0jpf6/ranelutuzag.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109050538391365694psk6z.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/repevafawifizuvobutamen.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/98429857919.pdfIn PDF document text
    • http://salwex.hu/file/45965528685.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/tegemosolopu.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/gafifakimiximades.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7sp2ia67nigcrmshqpvthk8kum/xebetonulajivurulozi.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/mewekup.pdfIn PDF document text
    • http://mousike.it/img_ins/files/95918710375.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/baramowinaviluf.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/pixafelud.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82070660647.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/kitonavilafi.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/nivinoxilifojeril.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/ketabefij.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502025aa2a---tirovemaguxuruxokolugoluf.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/nuxet.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/gefekojonijotonikulas.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/14c69c0b50adc4e34b4d095f33646005/xusekiwelatopenopupabino.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902230220.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_off0000b1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 18664 bytes
SHA-256: e04168c31d51b7bc4fa34abbe931ef8bb4607c2ee0a5299661f41e546353b9ca
font_01_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 11120 bytes
SHA-256: 555856529e009ded70933710ce4ade8a6e5f0e9b9f0e0a6b2057e444f2c8e053

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