Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70350dc5cf63313…

MALICIOUS

PDF

74.9 KB Created: 2021-09-26 22:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b559612976ea2b2168d4b9f9f01ce6c SHA-1: ac925976a3486fe725843382459789b0164738cb SHA-256: c70350dc5cf6331310ec7c003db9c0e2ef466291aa9ef89dc13fe9f14a35b9e6
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://irlanc.ru/uplcv?utm_term=letramania+1+pdf PDF link annotation
    • https://mn-lawfirm.com/box/userfiles/file/juzadejutawaxodi.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nodebofabupesetakogipife.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/laramusofosesab.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/zixujogifudomogidugesiv.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/74bc7b1b136d412fe973bb69a724cc06/todadixewupiruj.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/30116893858.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021918_35544_877.pdfIn PDF document text
    • http://rideco.hu/upload/file/44071765027.pdfIn PDF document text
    • http://mousike.it/img_ins/files/rojalolanewusofuxidu.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/37676637311.pdfIn PDF document text
    • http://entrackintl.com/uploads/revumudagizoxana.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/84708926852.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/kaxob.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/25128167372.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7625899e3f3758de8aa6afb62056de94/38548837159.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/tupatuwote.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5d1e71764812a4b83aca76c052591191/pogata.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pisadokaliduzabejo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/xuzitin.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/67558783665.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/7492592647.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/251200203979.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/19149571956.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393094cf69c---29570770793.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/lowirel.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109090949549955.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_off0000bd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD77 18980 bytes
SHA-256: e2b34d56f00b7f9f56d901e3cf719d1867d601fec6452206e238a3d682f8b437
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10336 bytes
SHA-256: 19fa899126bf8f43d87270c511cf54b71c42ea0c9aaabea30f78d4d9d2fcc4b6
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1