Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aa015b13bd539f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 01:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae2024fa285b4d67cdbc0adea4d8c91f SHA-1: 3def678eeb751467c55887fad938f0b29d856042 SHA-256: c7aa015b13bd539f8b6f38385558164a859309e62713640a953943ea032e943b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://12shio2.com/contents/files/lusonimogatatotapawen.pdf In PDF document text
    • http://mnwebdesign.dk/userfiles/file/wevitumeda.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a3293ccaea7bbc001a13904edb8077a4/8007594716.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/kigororozozep.pdfIn PDF document text
    • http://ezibra.pl/upload//file/86847753423.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/bojoxafuzeluzeronoxajob.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c142c9dc2---ranin.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/gowetatu.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/20278804208.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/87217982582.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb9c91d9f---rikabikijomeledokadonuzo.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/51789727201.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/34920005740.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba9445fbc---13293640806.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/salidana.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/96733980198.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/fff912b66e83a74b38d9098c1e87d83f/85757240864.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c7d71bfa9---89599902400.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/59034790559.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/novenakitugawigidebud.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lnrl7c7onbqorepe8vs7c63jni/vumidulebopafim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+is+20+lbs+in+kgPDF 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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 18232 bytes
SHA-256: 783c8f32963e47e5d1d1b1cf3246383b4a93ecf08981a20d857c6651d1079955
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10836 bytes
SHA-256: 0914c46ed8f876f002cc4902549646079adb8b28fe1453dcf0e512ea598c1ac0
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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