Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc25042106fa8690…

MALICIOUS

PDF

112.9 KB Created: 2021-07-06 12:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3ce684d63a3036b424c7ec999adef843 SHA-1: 0ebbcee8b00fdbdf20436d6fcb5d61509dbe496a SHA-256: bc25042106fa86902ce2435a0da5649c7fbf5494e676453b19bdf433cec1fbef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a malformed exploit stream. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or trick users into visiting these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ledins.lv/cms/file/rujamakexetedisurema.pdf In PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/jobaxejowupokepefitizudu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/21882602282.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/51bf17fee687675f9e2eafa32430d675/wosojofozuvaj.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/0bfa118f7f0cc844e5a1c78a7521919d/dixowiteterovi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608712ef042aa---43290453349.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c5bb2c5871fb1b1e635a2cefa9786f59/zosiporusiselowiwiwa.pdfIn PDF document text
    • https://puppometalli.eu/file/jenikoxaxuluvin.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e2e36466f50ceb15262901fcc20b4d33/lorudu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/su2o5u7i15qm4ug9b41ddlv4j7/zuporegadawuzemupezalu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb328fc5d---26664473666.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/217e3067086d27494898502ae4cf3b2d/25643897956.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/xagisozinodoj.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/bbe96843e95f3c0319867c56179e7e4d/didaku.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812cda5ea7c---fadulexosofilok.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/42436376045.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/sinixi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9e60e9a6---jedutirolomoman.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/nb2oe4l7kqmb9i9p1ha834e844/lepavudul.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98ff65b2e---winigegegokanejopaduv.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e618f2304f41bc0ec897fd0457e364da/20133465078.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/75291039161.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160895f8719189---65339426955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fll+to+turks+and+caicosPDF 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_off00015838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15838 17768 bytes
SHA-256: 855cf0dd250b5fe61dd4adc12e0b5969e3f86bc9ac55224d0110799b37a7ff30
font_01_sfnt_off000186a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EBD 10400 bytes
SHA-256: 2eeb500b4ddb45542f272379090b1931ab8d11205b62157f489fe3c1d1504700

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