Malicious PDF — malware analysis report

Static analysis result for SHA-256 061a1cc631e90055…

MALICIOUS

PDF

88.9 KB Created: 2021-08-17 08:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8c2cd97cc6961415adc563080b89b03 SHA-1: 515b48df0d5367b6da368437d365b09f10a17bc7 SHA-256: 061a1cc631e9005586405106b2812a1e5c3f1c5da9bf2bf46b74371c83f4fdca
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the presence of numerous links to potentially malicious content is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64c32291c---6733737367.pdf In PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab956733d7---fizokisajuduzaxubikimu.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/silakem.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc987ef30c---79381194393.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/zejizunizokigedetinuza.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/dawexajuweno.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/33313099746.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e0610c05a07f5d1a525eaeb996732686/fexusaxalexotezevufuzodej.pdfIn PDF document text
    • http://alcantara.cz/data/file/29201016255.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/refobazikiwutibewolelolo.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/938b375da7362beda8917fccfe719ae6/fiwup.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/51435712562.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/tojokivixurukiganebifid.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/3205968125.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/aa5be6c1700c1816614edb4eacc66836/xavapixinonuzeluta.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/np39aqir58190b0gnp85op2t0i/75255231792.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/14348817019.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160864e407b15f---58826737232.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/sebosabugedil.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/398b552e92d77ef0edd695b1b69d4742/wurilezigaf.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210618113332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=contoh+soal+tes+potensi+akademik+s2+uiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 10900 bytes
SHA-256: 2f0f8389858053c82aafc732439536c962d790096c0c0b981ed4e0a628368630
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 16464 bytes
SHA-256: 0898e92dacd44673dba7ae1c93c2d4e450609ae5de1b6759ddd07de6faf64fdd
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 19208 bytes
SHA-256: b33c144ba77910fa239f360b1bbbd1ca419a0d200dbff99cd942fbe161e93d96

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