Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f74be27287aeaba…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 12:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1e40efa7cc85fe9f13d22ab20e981a6 SHA-1: 2d41658835ce201d2e557c837436628b5ae4b2c8 SHA-256: 5f74be27287aeaba2aff513e2463b20777fd209547255010d972b34a16917d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://liepasmuiza.lv/userfiles/library/5835076526.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd48d4269---22156265072.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/lixawulewe.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelezewarovekawabepomib.pdfIn PDF document text
    • https://khanikango.in/file/xugowafis.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/39248183323.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/685ht996srmnpbnl7ksj5ohh7k/kikenes.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/20581184101.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/62207653360.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/pawoti.pdfIn PDF document text
    • http://exima.kr/userData/board/file/81437497066.pdfIn PDF document text
    • http://holzweiss.at/nazupagivorem.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/xojafaxogara.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/26406292940.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/bakugamurozaxuvosilem.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/75058399599.pdfIn PDF document text
    • https://phr4u.com/files/41596151535.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314b3a92b05---jurasavugu.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/82208286516.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/71747119180.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec5d4005a---99299241254.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/13344662551.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/11794337400.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/65336806624.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/8728918403.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/boluwab.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tililit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+san+andreas+pro+apkPDF 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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10376 bytes
SHA-256: 5a981591d68b72cc1b6bb5d4199d2071a5c9396f803e73263cf5469c75452224
font_02_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 20764 bytes
SHA-256: 5fbcfceb83b6fc636ee326dbcc3631c29d04329d4078ebadeb99b5d090509e35