Malicious PDF — malware analysis report

Static analysis result for SHA-256 1889807aaf176432…

MALICIOUS

PDF

160.6 KB Created: 2021-09-06 04:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdc81224af2647fb614bfacefc8b9018 SHA-1: f2c8bfc019415971778c9bcc07172a0ae4e450c8 SHA-256: 1889807aaf17643245a0bfb869015713e70688af335a08c08fd710ee2b02ffea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://synerhu.ru/uplcv?utm_term=the+universe+dark+matter+worksheet+answers PDF link annotation
    • http://pokorny-podlahy.cz/UserFiles/File/jariwojutixuker.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/n1bmh77va98gtkqvd93uekf4jo/26967151328.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/lusovusetojekijijetab.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/zatubozezuja.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/81267339573.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/134241193.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a2ed1d6401916f34073f054119017101/tevexoras.pdfIn PDF document text
    • https://fond.ru/userfiles/file/98601183757.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/bemomosuzugopoxisewugis.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2202144a---vufefujetadolako.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/7200477052.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/27144239819d4f58b759278c03650ca9/bekekadekenotoxorew.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/24481460094.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/n84jagbn8kvuh1vt6f9l8e90t3/51930599313.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/34c2c344d05e1eef9575251fa89543cb/xuropo.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/75746554080.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/48261221815.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/lewisajogakema.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f99420c0b41c7e478481e9bcd757ebcd/vofiwogejebirafipe.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/66009631696.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/24093839653.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/69c6f9ef80cf3b6101715a0e62c464c4/moxesukog.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/25987248928.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sewerezegibi.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/nujezi.pdfIn PDF document text
    • https://marosme.ro/hirek/file/86337002783.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BDB 21428 bytes
SHA-256: b26bd8bf19c18478da07f0fd74a7a27441d861f10c7f2ea033c1196d3c61f132
font_01_sfnt_off0002435d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2435D 10776 bytes
SHA-256: cb562bd0c485c0e774513998c9475cee112bf87a774eb004d5e5731e0bf6425f
font_02_sfnt_off00025c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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