Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca346fcbc235f2e1…

MALICIOUS

PDF

85.2 KB Created: 2021-08-08 18:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7004dd58592fde4f2a739ef0090a3d53 SHA-1: 87ddf7c4d2022489fd4a287a6f2ea493a80816dd SHA-256: ca346fcbc235f2e19bd2b1397cb563581a68138b2239f42fd16d1007fc8057ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to domains that are either compromised or appear to be disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ffrp5e3kmain1b07nqnv7m1kgd/93073752834.pdf In PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/21617680264.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mt0tff80p6m7t90vcf31u1oi3q/16356546762.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa5b1bc45aff029038a5d5acf7d8902f/geterizeragojunageriju.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/78876202079.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/rigomijukitenuriburekow.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7c7df339ed50579754ba57f14b6837ed/98881723330.pdfIn PDF document text
    • http://cloverdiamond.com/file/rojunibabatofaruvawesuzos.pdfIn PDF document text
    • https://go2germany.ru/files/file/gudazi.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/84612567753.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/vezezod.pdfIn PDF document text
    • http://absigorta.come/file/sevar.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0aa857355d195899eef1197bc2416e77/tisikabopozug.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/28086755310.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/85405286398.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/cfecdfa3c8b64364d9741db278d57c3a/3331170984.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/258395982.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3d9b735fa---79154947623.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/bf4ef5f4b964cc0eef01a4e7111a7b5a/tosigalixusegejox.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b5218def6f97fbc3ac343a0c768e980/13870157860.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/zivulixivu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/047fe429047d5b9aecd5a837d86b3460/givope.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/nonigexaro.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/u58aurm9cfgc7gphbld7u4v7mh/rabivepewotitaboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+little+tree+car+freshenerPDF 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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 10608 bytes
SHA-256: 1c7987195bb8dc1b963054c1726a0185788d1c6904898e4e3ccaf456d6323be1
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 17744 bytes
SHA-256: 0f9b844ef78817b19609b5e55dacbc299a4aa6c6e3b13065aea73f2d5d7815f5

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