Malicious PDF — malware analysis report

Static analysis result for SHA-256 550e9d733217a613…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 00:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6513a173901e366904f98efbf72d1733 SHA-1: 1d193ad197de3c89d6a4bdb7a484d64ec398387c SHA-256: 550e9d733217a6130e9467cfdcdb4fbf1fa07dbf73e2aefd52fb150c842f09df
256 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document's content is designed to trick users into revealing sensitive information. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=como+usar+adobe+photoshop+pdf PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/siwejarukekozexaranasujij.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/810f2be9242437d70f0c7f828d325c2c/37514146821.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160942dfe2bfea---gakizivugewisozasuga.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/rabunatubofelipo.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/89342338793.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/gikagedo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/62586993236.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/91889492526.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b32bc664d8bb5546de0210ed57eebd0d/lapinopimonuragazozema.pdfIn PDF document text
    • https://datajournonepal.org/files/nalotuwunurirorizoreje.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/xotojosoniget.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/2424442961.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/10374906308.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/f4k5480obs7rsrr4vasg3eupig/2895927304.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/bisinebojej.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/4ecbd308a05b0b86d37e6798ba67a5f4/21027197155.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/futajafibujuvilikoxogi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///tuwukuneverikate.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddd1fb9339---fadifofasalosi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948e105e8cf---53583069783.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/78824258534.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cfd7e3594---28996037434.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/7970983830.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/vewitomujiro.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 17696 bytes
SHA-256: 0faa1855f6f87355de83b832b42357b035f9566c9f5f7f697830d740ec1b7cc7
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10792 bytes
SHA-256: ae392eee2cbce5d18ef7379166378bd42ae051711b20265896023f2f14dbc8d9
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1