Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc35a182b0663bf…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 16:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6abeb0249a614dd6f3ed6941b5cb6dca SHA-1: 5aad88aae54f0bba5c3639e4feaa95905ae488be SHA-256: fdc35a182b0663bffb2e93d96dd11159221effff185d3d2774b364e1a21a90be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=the+beach+house+full+movie+online PDF link annotation
    • http://formel1vermietung.de/userfiles/file/paluxejupijilakupexe.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/sexokusijela.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161331a04e179c---44758727232.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/puwilexonowido.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23031f60c---jujejibowonamokuniw.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/91803844754.pdfIn PDF document text
    • http://dezis.ru/uploads/files/tutirasuwesinel.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/wonusog.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/revaxabuta.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/mowematogo.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/zurupa.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/manoremogovexisunilofu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/95554027262.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/99976282054.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/59702490996.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/88718034155.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/58795249028.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c48683ef5---41713432991.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/33947824982.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/larafakunefabixan.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/89498803709.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/satojodofojesikag.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/070516341191.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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 17944 bytes
SHA-256: 2e0e5ff21849b3077cb52303c878b7f7c3255ad72922302b820b002f7287cfb9
font_01_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 10672 bytes
SHA-256: 047d9c9d34824a680e353cf9bef1c8e7ff06294b769ae239a91181ae82fb2b7c