Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0e222a7833b344…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 03:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc0ba23f20e66e287ea692ef69046712 SHA-1: 85fe5e62c7b45683ddabb8b2c5bb8b2f7bd55c66 SHA-256: 1f0e222a7833b3442a7142a35d0802ae1aafb55de1aeccc7fd8f103fb595fe28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://thefertilizerproductionline.com/d/files/pomema.pdf In PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/31122341807.pdfIn PDF document text
    • http://ingore.cn/upload/files/11655340260.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/turizabikaxonabotavex.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/pazurore.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ojilimipe.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d43977727a9baeb1d3a5da8047e77742.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ccrl2fqvs4m8qhvv5e21rv9p42/28664448908.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/volojuzuzibi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131db3d5fa54---41935562268.pdfIn PDF document text
    • https://sergiomauri.com/images/file/zalokoxololapokagaraguxi.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/votifak.pdfIn PDF document text
    • http://imbirimbir.ru/files/rubizaludevudiferika.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/2780096562.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/5775434643.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/44878342212.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/mavutupulovabekew.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/29917470772.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109051115426282.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d36657bc4d---31516633053.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/44902996937.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/sowone.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/85412607765.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/43225529317.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/14443964116.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/44979590418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sd+movies+point+war+full+moviePDF 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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 10984 bytes
SHA-256: d7e48e5f22dc24104293c364af1a0e1ffc02f53c48d41277a9692915f6c4797c
font_01_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 21116 bytes
SHA-256: 6ad7ac9b95112976a74bfbfa709f4fda06631d4b02ff3b3df8b0b189eb7f9fbd

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