Malicious PDF — malware analysis report

Static analysis result for SHA-256 57617aa1ba0fb62a…

MALICIOUS

PDF

76.7 KB Created: 2021-07-13 03:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 113734c6caca9c3020b6e5e45441a55b SHA-1: 4f1bcadbabc4b0b3da2d90e12b7b760e87e4d090 SHA-256: 57617aa1ba0fb62a4f1c3d4d0eebcf4a3242b41ae0f54dda12a78590156c6189
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This pattern suggests an attempt to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://sevenseahotel.com/uploads/images/files/64254862839.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9922f521f73c9d2d81e54145db96cf6b/72399137118.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34667a025---dajulidosaxiriromulo.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/jojajuzawizefanop.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/88315625158.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160853e513ce53---43302059651.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/17986845976.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/26577876738.pdfIn PDF document text
    • http://computerdoki.hu/user/file/52294612146.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/s011l2oerui2d7ft4j6300fvi7/lojunuzalawodanex.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607140f1d25b7---kulufujaroj.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/48537948743.pdfIn PDF document text
    • http://accronline.com/userfiles/file/gigunawipix.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/18849591766.pdfIn PDF document text
    • https://area5srl.it/file/41888623212.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/kusitivorutapovamipob.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/b83e0cbaed60b391f59c075ac1421d6c/2151572031.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/ziwisel.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/25951158822.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/putetetedodopixaf.pdfIn PDF document text
    • http://rc-modeller.se/images/file///43210709370.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/xofogidixuje.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kikonedezinudol.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/77399804006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=half+term+dates+for+october+2020PDF 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_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 15944 bytes
SHA-256: 9fc677137ec295a11849c16a9ab71488b123e317434031d70e31d947df715425
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 10812 bytes
SHA-256: 0ec820905614612121906ff1f10a2704257ff2062f4d895350e2c5044f126347
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1