Malicious PDF — malware analysis report

Static analysis result for SHA-256 f418bf5c12506033…

MALICIOUS

PDF

80.7 KB Created: 2021-08-19 02:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c64d3f57a0afd0a9a9d4db63cf1f0ea SHA-1: d66fe20a5b6a12984e92c8f7f11f15eb8e402e34 SHA-256: f418bf5c1250603366e2f575cd2580822cd5dce9cd724f9c7880f9f66ae4a0ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a phishing attempt, with a high ML score and ClamAV detection confirming its malicious nature. The numerous embedded URLs, including those hosted on compromised WordPress sites and disposable domains, strongly suggest an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=valor+absoluto+y+valor+relativo+de+numeros+enteros PDF link annotation
    • https://crcnueva.naturasoftware.com/uploads/images/files/jasubidamifixa.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/mopegoza.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cea865e40---13763292217.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5c8b866469883c07b379e993e110f9d6/guxutodunelutol.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/37601718617.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/74967997104.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/2388474317.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/rerajabax.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/27714339348.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/45924813233.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/35958950734.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/590725e47f3a9bf6e13fa44480d6161b/89194041464.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e349ebce7803def7efb0dc95900af89e/51710793893.pdfIn PDF document text
    • http://usmleworkout.com/files/file/75084857335.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb62398a9c---lalesexugo.pdfIn PDF document text
    • http://kelvista.lt/images/files/62068432694.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/feee77bf7090df30d1f2cf5e59292a5f/zivatogewaluwudibel.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160876833266a0---pejelaxoxetadimetedug.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/kijakisegagegaki.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/verovup.pdfIn PDF document text
    • http://s-box.eu/upload/datoteke/zukijufixeb.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/bc67f5ed38ec4a59e3ff684e9f2f8eea/xogegadosusirisila.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/94369227761.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_off0000cf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 10800 bytes
SHA-256: c6dc08ef5b4d43f940df94541e9f4698196bbff6525ceca62935aa158da36e3b
font_01_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 19420 bytes
SHA-256: 379e848a5a1ffad65b1b455b76b80e4fa3f083b9587acaa327a4133192cea1c6

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