Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac07fb06632783fe…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 23:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0ac0f4503abc2d98bb15fb4d6792370 SHA-1: b2c706a3ac48c954f65509cad5618d521f138011 SHA-256: ac07fb06632783fe13637dea93a0597ccbff78a9987ce3a629be9d92c852af8f
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 external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=game+loop+apk PDF link annotation
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/dajizegoradepatuzoxa.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083789913c---dufaxovolafuvakotama.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/nasutiwokavusubiwujebuna.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/76085935092.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/50889607892.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/94551419337.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/zuwaz.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/75763986687.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613666c52caa6---75184505155.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ec7d6be1---bobarajiwe.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/28198846964.pdfIn PDF document text
    • http://edituj.cz/res/file/61480841931.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/jajovuda.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/61668481337.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/fazirut.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/40336861421.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/76bbvne26m25p0vki40u8f2os0/41375619695.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/wezuminoma.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/tiduwurijopetibusi.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/togisifunixivuva.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/wokejirefopixutanomuxe.pdfIn PDF document text
    • http://btfa.tw/upload/files/fafufilulubedejaxe.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/juxabalovefizowubanu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614683f1db2ed---20908275216.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_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 17172 bytes
SHA-256: 318faadaaa6c3286d90d2e87c4fccca3f7346aedc1b09adb9999941121e757b2
font_01_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 9984 bytes
SHA-256: d57c04a81ef24cfe5ce180a726b411629f3092fbf82fec85638c62be7e62ede4
font_02_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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