Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc3098e5ba6aa05…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 07:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab71c6caefd071f2b93651aebb278e3e SHA-1: b87a9320747c2368994ea0c14c5b287088a28582 SHA-256: 9dc3098e5ba6aa05b3c8a6148633b6d3961dc3f7a0014dcbeb797f7d6c453ae7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farm characteristics strongly points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=online+radio+box+apk PDF link annotation
    • http://seanmore.com/userData/board/file/82640491786.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e446592ddd8dd57fdd39e66533dcf7d9/37719277907.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/kubisoxevixeronu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee814bbb1---kefefekigexonaviro.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/tumifuloroxadijepogasa.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/l2sq0kt71lr024r55hq26qpu53/58420025212.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/64497527775.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/9634672404.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/96347917495.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/15265652367.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/93688485010.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/14349065325.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/371217939.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef08d3a76f---49847898680.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/wuvenawabeniresolumiti.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wiliwipiwakupaxube.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/dijopowiderimukowibumo.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/gojojajas.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/nutax.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/77606191201.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81281100542.pdfIn PDF document text
    • http://hejia-ele.net/upload/wufuvozuviludiwamas.pdfIn PDF document text
    • http://marketingnews.fr/images/file/37383983553.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219191317282854.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/79457321363.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210923/file/budebakazivogifi.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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 17148 bytes
SHA-256: 0e99329a436f47ea09ad0e81a803585575f5bc174aa5e7976cc49f7368b2fc58
font_01_sfnt_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 10476 bytes
SHA-256: ebf3491ed51c36f04b27632a9ecbd63e417fdcbdeda89a7d58669b3d6549100e

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