Malicious PDF — malware analysis report

Static analysis result for SHA-256 d828168437b932fb…

MALICIOUS

PDF

94.8 KB Created: 2021-09-07 18:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01a985ece975eb27ea4ed31c5895d8a3 SHA-1: 958c9364f3414a5115198c188bcb2ce006414816 SHA-256: d828168437b932fbc30a8f0ba71fb6652401d7200a33aa85186b703440c04c03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://catamma.ru/uplcv?utm_term=what+are+water+borne+diseases+pdf PDF link annotation
    • http://serramentisiciliano.it/userfiles/files/40593705734.pdfIn PDF document text
    • http://moneymaker-gold.de/files/31896600465.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/buseravukobizusi.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/pifogenemuragege.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/383420fab1e4a9545e792a22134496d5/83573487174.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/39483857596.pdfIn PDF document text
    • https://12shio3.com/contents//files/jewalumup.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/vomarelurototafenev.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/21086162805.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/45148114063.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/9522912133.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/66476116519.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/7910676934.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/99626862515.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/13d4430cbf6fe10597f87ae7a4a5f6b8/45989006756.pdfIn PDF document text
    • http://ipceurope.com/assets/file/tiseveduka.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080620776076---96871077849.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/81019693845.pdfIn PDF document text
    • https://hagepoorter.be/files/files/xetetufagobokewifinikip.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f781e33a---deduxisukejobatosobodus.pdfIn PDF document text
    • https://ntc-container.com/upload/files/30184592037.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/84095664280.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa214cc1d---20173583525.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbe270a43---39233954853.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/denegexo.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_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 19340 bytes
SHA-256: cd1bd67bfbe5934e7279fad769b5ddfa1b92cb5c84a0c3dda799b9d35fb46f4a
font_01_sfnt_off00013d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D09 10768 bytes
SHA-256: 674f248b69d0688486e3ec2caf0e57eba72459c6259f5f195b44ff4ec02a702a
font_02_sfnt_off00015596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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