Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e880fbc2dd4b4f8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 04:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ae4a04c16e894f0943953ebaf70469d SHA-1: dc8b123e36945a670277abc52765a56c4ad074ed SHA-256: 7e880fbc2dd4b4f8bc707e0a2dacb2e49fe3227f5eeb84a6b031407201098701
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly supports a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://saptabangunmanunggal.com/indomobils/upload/file/4968696918.pdf In PDF document text
    • https://mollis.rs/files/bixutazufugikoros.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/jiledizovexojate.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/94661960498.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/mofolajikexizo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/50lrcbk8suqmad5j89rsko4lpk/davotavowepovar.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613258d36f377---fomijujajamupevuj.pdfIn PDF document text
    • http://dsagco.com/Upload/file/29174316698.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/32499610215.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/99955965148.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/rigubusopipobibajumupol.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/92142175612.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f5859b9632cbf3be451b00a2856b2559/lexawopabaxogipuji.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/71718153281.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142138e386e1---29333871164.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/puzopelufon.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/63004214907.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/65040338639.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/65513895471.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/47351946093.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/nejov.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/70046245007.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/sitafiregevatajezetava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+game+in+the+world+without+internetPDF 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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 17592 bytes
SHA-256: 86d17b880a9b37969e636b4b5d055bf6484032e3e98bf9d4d7727aaae53d90c0
font_01_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 10936 bytes
SHA-256: 5b74031b02f6a5aed2d5ac589320af28b0b524c70c8914a043ecf2c0b8a88dcf
font_02_sfnt_off00012884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1