Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6874cd04b03d22…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 09:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aba7023cb78165870a1da51e13290479 SHA-1: 890841f53520e304f4c89180a8720f43f22e20a8 SHA-256: 6f6874cd04b03d22998a4007ee96fe9da0755943a6c00ece31f9925fe35e0ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sgyscom.com/upload_fck/file/2021-6-21/20210621030622892775.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8d125ca70bb376e8194ba80b9ba0e12b/72023049154.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/lutuge.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/mugubej.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/53358052716.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f41ca196eec418df45cec8cad5fc696b/mizoruvadazasagub.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089715836505---megugaxo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/86884301428.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/db8a22417f36b47b92038769b9d5bba2/14406424100.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/60518739f8599bed4544774a6c04f40b/nesarubo.pdfIn PDF document text
    • http://mextro.de/upload/files/21549167728.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/vopoloxonepilaj.pdfIn PDF document text
    • http://yjccnc.com/upload/files/sutolexuvup.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/choh0gg3dkk9m2fcn8r4b3logq/93698530086.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076fae26aeef---94936984681.pdfIn PDF document text
    • http://popmetre.com/news/files/91799487025.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/77796924589.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///8224467758.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/bowefipomililoso.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/reribawejamaludusekemo.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16297142144447.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/32785677323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=finite+verb+and+non+finite+verb+pdfPDF 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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 10460 bytes
SHA-256: f9a0acc79931048fda7e7bede880562993aa276e386d0b15c8a48113af835117
font_02_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 17916 bytes
SHA-256: a7967053c10a6d20b18e9cfb70e86074c45d55e373864007c7f5b6f7502aad71

Open this report in the interactive analyzer, or submit your own file for analysis.