Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b4e1c09c69dd3e…

MALICIOUS

PDF

80.9 KB Created: 2021-08-02 19:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c8d0bfdbf68cad95b73ae000df09498f SHA-1: 656cf38a3f3b494cddeff1e7995ad3a89b2b8ced SHA-256: 01b4e1c09c69dd3ec77e78f0f1ff80ee32d20f595ba7fc334e31932cc2a0a6c7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=soniye+hiriye+teri+yaad+aandi+h+mp3+ringtone+download PDF link annotation
    • https://llibreriaha.com/img/events/file/44499065316.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/93340915045.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/13306025964.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/20e452a77136412d13af450cb7918869/zepenebazivipe.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/36580292850.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/kipegukis.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b141857099---tovamow.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f9c0bc701e653014307303b8580dd5ea/nozudabizebexavumixuru.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3b68aa6ae04509af420de01599834dac/wezew.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e71dc36a---82981348387.pdfIn PDF document text
    • https://micsys.in/userfiles/file/xorebubevokasumetubokiwuz.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621434260.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a2caa433cc05880971732955fa87ffd1/60658707936.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/vixerig.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c6935f1ac2f5d0331c1649c6a53e462b/41433291997.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202108010913199462.pdfIn PDF document text
    • https://retta-bg.com/userfiles/36236459185.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/mofakisuwuwapasewusil.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f95c63cf28f580359dd70dcbb4a822de/97357939530.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/55844421786.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/77967625278.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fecff1c025e8632524b82c1142a1dc9f/18137565219.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/64032215313.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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 17200 bytes
SHA-256: 980800ec84d6fed3b4ec1cc34496dea403f0ed8c570fe277875a679ca7d57ac4
font_01_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 11116 bytes
SHA-256: c496405cb801d6f27a4022b890438fc3f511a1bd706e3cfb432655704a5f035d
font_02_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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