Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fea9959892a5ce7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 09:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3d30c92e3a79b2088eba08a66479470 SHA-1: 68dc4aad780ceab8939b3c0bc27c3613280f12f7 SHA-256: 0fea9959892a5ce7ebb140b84808fcc3dfc60ea5e540ac7ba5a64eeccbdcba8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites that appear to be part of a link farm. Several heuristics indicate that these links are hosted on compromised CMS platforms or disposable hosting, suggesting a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://strategieb2b.com/userfiles/file/wujujoxovapi.pdf In PDF document text
    • http://administratieindex.nl/images/uploads/76449081169.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424aabed21e---79559044608.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/wugepokutuw.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/50039493712.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/14202486409.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/13699359456.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/63265583027.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0e432840---62000995096.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/10399130985.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/90532647302.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c60092a3e39735f69e6097f2a62eb1a7/27663809747.pdfIn PDF document text
    • http://koutingchina.com/upload/files/ketimixalawadumuja.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/jipiwopewozuba.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/kejunok.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/wunazilogebozaf.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vfo1eho8fsiafd8ov46qca1pg2/dogowot.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36a3ba3fb---bapaw.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/vesodijazadinavibajoziro.pdfIn PDF document text
    • https://petala.gr/userfiles/file/95281404600.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/beveramewurezijiwukudeg.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/48646061606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=can+i+recover+deleted+photos+from+phonePDF 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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 17580 bytes
SHA-256: 2e43b14b639b5ce26e12a537c5df07ad98c31633760998a7e21525e1b2d2e1f9
font_01_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 10980 bytes
SHA-256: 526af5e2c999871887631c9ee9eb56d22d78df373d8cddc19e5f121deabe070a