Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0632c521bdcf54f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 10:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0985b5fef16466ad506ca4dabd025daa SHA-1: 68a9d56e72c603b029cc5b3c00c61350c2b6cb3c SHA-256: f0632c521bdcf54fb44097a049d273cbd2d6aa0f0090155de8a0fd84b0ff8e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. This suggests the document is designed to lead users to malicious or compromised sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608653d8aea74---xumojedokarazewipabakil.pdf In PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/64558844229.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e18a5c2b4873a9aa6e30e2e165b51f91/tirafewogulimu.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/79091640602.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/18119920921.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/st3p6cbgtvtvjv1c8tjohaiopt/defulafubalexoxojerizir.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608c41fbaa62b---vobavefepinegovokisapa.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/23c29fad83bd4d43ae6f8e2c2a1b8073/91309284019.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/24147171696.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/224b064bf1735e0b38ef1fc354005451/bonigafavedukus.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d2d70cc9e4ff7855727502c2631bdce6/20391640452.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/13008543745.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/86869374715.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608908ea4aa8a---tarakuwujexo.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/wifisijibatuvedugusamawim.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf970ecde78---41325763905.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098aeb57b01b---magowepuvijapirakaboxenof.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160726b27ebc04---jagavukiligevake.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/wefijikeperux.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/pr8jlhjprmdpo3an36ndon03ir/tofipenosujizujutex.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/mufomoriwonejogo.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/97804021281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=new+toeic+reading+practice+test+three+answer+keyPDF 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_off0000b8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 16300 bytes
SHA-256: 87f3bc78433c038ca5f8352e6778ca8eeab2b84adb88a5d7c149b7950eba4cf7
font_01_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 11016 bytes
SHA-256: 54cb8ca76e024774ae26c277454862683a2dc146438e38abc17d2689ba1c2151

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