Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bb00d41905d903…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 13:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99b47aa0ffee6b5780c3ef0c48c01e78 SHA-1: 42e8b5e7f96109c3c48aee0cb07daadc30431489 SHA-256: 03bb00d41905d9039892d98323718c0cbe64132fd99475c6fbb1f3876a408fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's likely designed to exploit PDF vulnerabilities or host malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210628141513.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/rowegelejumeni.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7c6de9da---46800279920.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5ae81608b2e066c9191a36fa7d11ef67/xugabutasafivewubasenozak.pdfIn PDF document text
    • http://abwrva.com/uploads/files/926020642.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/16960737436.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/gowapisawoverubukokavag.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/xunowepikeriferimup.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0fcb70eb---vojabokisajupun.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/92004788806.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vag88sfci24omau357d84bgnv3/tinedi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6eee30bd---50775995327.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210525030125.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3278_20210708024319.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e3b452a235af0e23b4e31b6112bf8267/vidupagiretuxabeduwimoro.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb7ebe8e---53588498858.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/05ea1207d276f4fb69d471ee6c2f3f04/7626858970.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052411215773499.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/38489036087.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/i5qn0i6vmt2jd8v166jna6968n/rererugu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba61f6af09---96802475980.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/73699780536.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/rokubupijedatabijutani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cts+practice+exam+2019PDF 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_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 17856 bytes
SHA-256: c5352264b47c8623660d8887ecae02a1f875f37966a6103ae67cee0898e847e1
font_01_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C93 10860 bytes
SHA-256: 4af7e3e9f3a3585b7df6d5bd2c76a6e2a2fd08d594988e0d08c0cf86d5ee1c5d

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