Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7b59c788d35305…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 22:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b95e8815060c6085b0984885af81209e SHA-1: da4b1638ee4dbb13742b8f9b31cf4a534149e657 SHA-256: 5f7b59c788d3530595f4bd63cf86da7033b9286c10415c0b0baba59ee1e6d7e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests a phishing or malware distribution campaign, where the PDF acts as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1b22d252f7d63cb36b29ba3c94c6d6e6/figomutikazanav.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d0f68398dba1453c68ea14b01570e333/43328886470.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/cb46ed0baa389356681039164baf8471/21022507938.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/wavume.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/40994921798.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44be1d233---motojatamamuguk.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608181d653d11---38425712595.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/rilozajexajevexatelij.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/dijizubesefuna.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dfda9be62d7fd8c0a97529b2c72c8f86/zebagonozabimegakodul.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/naxuxufutoledutebu.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/mowosamubifogutosinavive.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/kevirivowiso.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/sofemogu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7635a4d05be607bdf2f64dbc2f09375/53504268265.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/10845648927.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/3238829341.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853694020a0---92697773602.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1bfebdee4---serujipata.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/18894035054.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/20176355818.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/63003597492.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/786f059e976f104d13d54d32450d0605/17461290387.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/43969329809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=stargate+universe+charactersPDF 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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 17176 bytes
SHA-256: 28af104603d34497870c90fb8198671a86bfacc98dbb66157ef6cffc0a65f3fc
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 10584 bytes
SHA-256: c6bd47b542f6977c46891088093f25b4f46e1740e6db2bc57018643c0af3d751
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1