Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d14a5990dfd0948…

MALICIOUS

PDF

109.9 KB Created: 2021-07-14 09:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2aeae3efa8a54ba43af5f1a7b809c0fe SHA-1: 42c8d0ce2134a426195251fb88c70190309fc2e6 SHA-256: 5d14a5990dfd09481456e3ec9e7a4b05cbf0243a2d7559ea7ac2a5f8e7c5f628
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to PDF files. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e55da8a4---tovaletamuveveroluri.pdf In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/53a8efbbfe7a78394bcd833791ae3a62/zeberik.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/kaneruwomoli.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1373617d85eb82a288c0cdd909016313/32869621799.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/73546746790.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/gokiv.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c6db3f6e0---80466101418.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kozowatatodokuramajaxumuk.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/weponefota.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/44257439373.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079170c0ec63---kedepewarero.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160870c3e38a05---34420374013.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070816373897.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/jomowesodajisejul.pdfIn PDF document text
    • http://goldmustang.com/files/files/68070285511.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb2c157d2---xoziwefojukexuz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c683681b94---diputur.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9d31a906db12285c6ac1eb208c860132/puxoviwivofonofinemidir.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/dagotumoguwexikex.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cb31045bc66---93489535964.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/77365454185.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7450b8d95e---79834252499.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rawenitopuxosumudezezenuw.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v8kuddbs5du1iifqr3ggkquujk/rurorusovi.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b43b77280---27600737806.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e66a16b97b---25901416854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=easy+literature+quiz+questions+and+answersPDF link annotation
    • 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_off00014b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7A 10732 bytes
SHA-256: 0bc0df53dbb2e3d930b1c6ec6434411aacafa5d23e3bce4c9dacd280219c8e89
font_01_sfnt_off00016427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16427 17960 bytes
SHA-256: 5189be9ed1865c840b42bc463f242c6f63386f753502d9ded1749c7e76d94479
font_02_sfnt_off000191cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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