Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed8ca5b8b077d14…

MALICIOUS

PDF

93.4 KB Created: 2021-09-07 17:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7091b2fdd4ea3bf8693aac0848490336 SHA-1: 95772abf5b8070dc85194cf185b11dbf54fe2dcf SHA-256: 1ed8ca5b8b077d1448ea81cfaa9074126c696161adfb0eae9f75782c3eef1945
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a strategy to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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=parasitologia+quiroz+pdf+descargar PDF link annotation
    • https://drosamahetta.com/userfiles/file/90120775302.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe1233428---naxifavuxokujadab.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/98447410549.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/50231347221.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11cbf459cd---vusexugorik.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/75b3d54l6nsrh5na0ad601rh85/gizesetozelejaduremiwet.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a010fcc427---79153773742.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/58832218711.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/74537325383.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210607052420_2114807800.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ddb83a65---lelamajurugamaxovidefix.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/345004476.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/70597813706.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/wovajizal.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/pofasifutuxofezosini.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc669af363---11152497527.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/selifat.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fbb33f49---20136245291.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/10728418838.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/23763518282.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/81886928038.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8b938ed8da51845e60a15ac6f2948760/suviz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ce64de5b---38459082944.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/80258490679.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_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 20792 bytes
SHA-256: 61df37cf0057ff775293d1d8f741b87f4bd98410b9f4a4c25b70e0b204f0686c
font_02_sfnt_off00014f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F01 10996 bytes
SHA-256: 83134ef5734757c64d2b8f9e8840ad90ba159338420d6b78b6e30770885bd301

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