Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f95c644c20aafd2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 23:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a98cc7f847af1683f10c0b4b66355bca SHA-1: fe900c860a433a210db0a46421e2db3d30df7f37 SHA-256: 5f95c644c20aafd215f38944ac2adabc5f31dcfc589a1c6b991ae13088db8ec9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. Static analysis revealed the PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or scam campaign. The presence of numerous external URIs and a link farm structure indicates the primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=bubble+tanks+2+unblocked PDF link annotation
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210904162725.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca11950b9---motewazuzubij.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/16617545467.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/82850895409.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/mifiradugogidokuzalupetin.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/da085cb9b7d68d673b2ec16fe240c072/mipononutoga.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/24648044613.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/26049469356.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/80849174550.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/57958464204.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/1756890683.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/zosesaxonuwesufijixu.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/44023647454.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/duxutumiravib.pdfIn PDF document text
    • http://aven.su/userfiles/file/vibowexunolup.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613df398bf50b---vaturafabumakewerivi.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/wexanupidorudefunixe.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/43245231488.pdfIn PDF document text
    • http://bjjiffy.com/upload/58717352150.pdfIn PDF document text
    • http://hexindechem.com/upload/files/nomaroroserijidat.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/gusepogixoluwovuse.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c4069c2d38a5531e25d8db3e347f9f1a/19613790793.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/sozapezilegiworofutofa.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/benosijijoxumadawumufeko.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/malomozipi.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/42727884276.pdfIn PDF document text
    • 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_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 10676 bytes
SHA-256: 488a190ce6b33b6a13fbee72aaa47a3dd7a50040db99a19046e4cfe3033f53cd
font_01_sfnt_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 17260 bytes
SHA-256: 85ae2651ea0d83fbed0177f31b392de99e8fb5c6d4816595c920a52968fc34e7

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