Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db8fa658e861ea4…

MALICIOUS

PDF

94.0 KB Created: 2021-08-21 00:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e3a6098010a162c9c8b200a14e2587e SHA-1: a97f87de5ccc1477640a8e84b2f6d579a8d2e9b1 SHA-256: 0db8fa658e861ea4f62213598dbf7be843324368d04c1b7a50353326b250fc9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://20thhelicoptersquadronreunion.com/clients/71358/File/94341538480.pdf In PDF document text
    • http://ohappy.org/userData/board/file/laronumux.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abb8e26ab8ac21ee42571061f83ecae9/16128707466.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/2078171841.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160903d9b4280c---78246465468.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725072a3e95---27551086471.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/db575348c6d1dc659b0e1765d5139ef9/nujiwirafimalarojivuxeg.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/1944900181.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/bipatebanewe.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/duwejetopurotemupubab.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/45506573680.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/drd8hd9r3uj5f3h7r30oij8u18/25824510376.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/764b8qsq9qrj4o8sc7v4m5p21l/77284768808.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/jeledixofobozed.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/2836984715.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/83541122420.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/34449719342.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/53620147595.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607892457e931---bizore.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/wovubofose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bleach+vs+naruto+mugen+3+3+apk+2019PDF 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_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 27312 bytes
SHA-256: e584292a0efb589e4533944e97631513e03e34b3b37856dbc25b4189321f1193
font_01_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 11676 bytes
SHA-256: e684c4226a058cdc779cbf3117f58ffdfd50c8e0805387c440325e9788ee015a
font_02_sfnt_off00015284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1