Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c54e6ef28259de…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 16:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 145ce9c2c6d2b69084b3cdeab6c002f0 SHA-1: 0357c0b04a6d6a7357c80ac4ee0a007b4a7e2652 SHA-256: f1c54e6ef28259de0a0c0b01d33f8f7c46da851c3150cba2b13ca45748dc072f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bokaichenyu.com/upload/files/gezirufezidu.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210714115830130.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5uhcrm88m9n4v7epk452dhhql0/80806654858.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/84827724720.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8beab3986---22399337954.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tojumupomavasewezaj.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160970cbe6e372---94598409492.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f819e1ae---11068079491.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/74a119b5f834381b768641f9da2e4a9e/tanivoluvewirisusafesejiv.pdfIn PDF document text
    • https://sealskinz.ru/files/file/kadipin.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2fh74oqohns8m4msu1p7nftqh3/jakagewotubusit.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/sinebuwukunudufigo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/622067d94f7cc84cdb786567978f6783/86786740727.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c341c885a5---10532016891.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e7ebaed03---25582262320.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/80289764663.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/2arsibrgvjv4i2iic5a7s401ds/48027222316.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1349462060f0a8917970a.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/29640317043.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/maserowowaxolilojoromap.pdfIn PDF document text
    • https://datawire.gr/files/files/20886230647.pdfIn PDF document text
    • https://proxus.nl/file/366000390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=single+phase+ac+circuits+pdfPDF 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_off0000bc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC72 17928 bytes
SHA-256: a8278bf9407bda532dadc57cdca88b3a66a8bc54ed40026dee878de368202704
font_01_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 10956 bytes
SHA-256: 4a1406f15c8573a329ee4974b1a26a84e9c0188e25b039ab8ccadcee1150e496
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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