Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef36819eb9db94d0…

MALICIOUS

PDF

87.1 KB Created: 2021-08-05 18:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41b32ec0d367de1827e478f68a8d807b SHA-1: a6240ece257862ec3284e48788171d3b59aa44e9 SHA-256: ef36819eb9db94d0592648d02d3bde9852d39059e3a1447550b881dddcce869d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised CMS upload storage or disposable hosting. The embedded URLs suggest an attempt to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jiuxingchaoshi.com/uploads/file/090957473751.pdf In PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210626_20B56C0F4AAD7AFB.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/fozisod.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/85177208527.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/h1rrd1ejtqt2cb98kssrlrsv42/vazenuxel.pdfIn PDF document text
    • http://emannsltd.com/userfiles/39348089698.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/vikerozakogo.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/finekizezubuv.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/nogusasikijidorexinipore.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073811c96b60---goliro.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e372ec308e51e5232304177f33410cc1/xozoxamefibimovozifevoz.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d872eeadad---xufuzezef.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b18dd2439---43975560874.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c9b4025a0347743c9d38cfc9abbd20a8/befinaboziso.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7bf9bb338ca310c95c1151485a497043/tulivogibuwez.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/weramagirexinomezises.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/97679042984.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa02ee279---gogolajukodunosewatef.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/aacfe32bb709f827a929666efcd404df/xavoxeziruvij.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4f596c04e14bba3a09d4e452aadac72a/32720129580.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092665fa7371---79092132608.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/niribej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kiwi+bird+egg+skeletonPDF 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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 17312 bytes
SHA-256: 1c927f33bbe08b4bb7feaea3d62e0430c38bf1a948953c81d05aa2a08ecde330
font_01_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 10572 bytes
SHA-256: f41dcfc96c4ffbf2815e8cf4eaa53ef4575055f2b1cc2c48ea02de572d76f79c

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