Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0a5f9ae3aa8cba…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 01:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d71bf622e9df105d42266840347ce62 SHA-1: 7509e598575cea849222b5f6c5ab21078fe71172 SHA-256: 3c0a5f9ae3aa8cba0480ed8a63e694cfa67af5b040f62c376a603419f1da90fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=usb+debugging+xiaomi+redmi+note+7 PDF link annotation
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/tuzebapifalufo.pdfIn PDF document text
    • http://iknow.pl/files/file/devaxeviril.pdfIn PDF document text
    • http://findusafranchise.com/files/files/41830688085.pdfIn PDF document text
    • https://davaocarrental.com/images/file/sojazawalog.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/raluwigiwit.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/77862044591.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/60687748081.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/67578209748.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/gorudixix.pdfIn PDF document text
    • https://limsurempat.com/contents/files/favovivudofelo.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/17727215791.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///97552721727.pdfIn PDF document text
    • http://limoride.net/gallery/file/degimosofizifobena.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/gepur.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/04e30faebd1792a8e382552de8fc0b1c/5777584313.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7f10f46ddb922ca80173119d5645984f/xaloregovimopuzesitazaxu.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/lusunefetofatonamejelofi.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-17/20210917232557913986.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/bubizotume.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/5519630939.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/62600419140.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210901064222409.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c67b88ab8a---73145635176.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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 18280 bytes
SHA-256: 29edcc20fed5a9e3e3919e681880db69be639928e054b2056602407febb8b86e
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 10944 bytes
SHA-256: 5d44eb5dfe1eae94c88f5a938ef21444d90e12f5f6270da8e1ae84c6aa236f29
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1