Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c143d76a3a8d0be…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 10:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 812312f8e4cf1c39eee6fbe3d541e2d0 SHA-1: 27c262e59f6846e644f4597b6e8e622b9df88516 SHA-256: 2c143d76a3a8d0be07636fdcfe0699ca461449e5ca0c4e38c19a92ab6001235e
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress upload directories, pointing to multiple suspicious URLs. These URLs are likely used to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f53de3cd---839190184.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/83e28f2cac2cb2c14cc2589ec53cd8a3/gimajiwonuweteximez.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/zekufojiguzoxubetapem.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/toladefoso.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/jegologezesadezumudiwexe.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4256457015---37258685436.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/velelexakufuxagako.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/lazonumopiwenufisasumuguv.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/24og12gqsf0fr16e1rc366ng8u/galepeninube.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/46641866416.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/xedobizawutojarun.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/87198055771.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/novojisenapujiju.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/28331068629.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ed2fu7okp0ncuhgs13uq2ualvr/61382133947.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/746be11351e2099c7703beab0453862d/33157051395.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/18740582026.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/xavafemamiteguz.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/ff80ebb0b5b648f8c1cb437aaad54fab/nimutufarusew.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xenuvedo.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/83803819738.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a326dd3c44bf3aeac55f447c9a03adb3/4124679419.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/950tvh4mbel0h5a22fj7c6cko4/96046561167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nulls+royale+2.6PDF 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_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 10352 bytes
SHA-256: c055ce26daae83aa66fb2761e25025327ba83e8d9737718d2b186f9e38e1501a
font_01_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 18244 bytes
SHA-256: 7cb0b2ee6c7240440470b0d945229960a563e247f4633faa72c5e7d7b9e5bff5

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