Malicious PDF — malware analysis report

Static analysis result for SHA-256 122dfcb2dd013164…

MALICIOUS

PDF

72.8 KB Created: 2021-09-30 22:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1d093548888ad9264efccf578d8a816e SHA-1: c38a6aee561105af17d8f88e2774aef20fafd8f4 SHA-256: 122dfcb2dd0131647cdb61764a2784b20efb4e8450e1145f321b281ab1d59fd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to compromised WordPress upload storage and other external URLs, suggesting an attempt to redirect users to malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=which+company+developed+android+operating+system PDF link annotation
    • http://toitureetfacade.fr/data/Files/zizowumekogivupuneveko.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d95e4b087455780d9caa0fb4cecda186/vowukuvatizelawuwoxekar.pdfIn PDF document text
    • http://watch62.ru/files/files/7468540018.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/18203019409.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/dutafurixezagokon.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/jodok.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210910135936858053881.pdfIn PDF document text
    • http://zenithmetals.com/files/42881055400.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/65057417662.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6511bdb41---81025109257.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/29789052227.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/vuvepoduvenejemikibo.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/suromojowomikijibiga.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/karagakako.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/zulibifu.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/kikijuwejiji.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/67765838726.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/59977267868.pdfIn PDF document text
    • http://dr-temt.ru/images/file/kasemigakedubi.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210925_6A3B9092931D874D.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/17377592314.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/fenetunamuzit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146abd0ab789---44390557689.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/19066085960.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/polopuxanelule.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_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 17440 bytes
SHA-256: 037e1d711b9193e2ea4f2c679d0321f3fdc81e4adceb08df7e8d80ad5fee767f
font_01_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 11136 bytes
SHA-256: 0c727e6ae3ffc6df62b1b965b5728ec2aa73d8c7efae9c541ba623d7b49e418d
font_02_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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