Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a05f6cd9678482b…

MALICIOUS

PDF

99.6 KB Created: 2021-09-17 12:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c377616f57ff96d387d6493cbf1860a SHA-1: bcbdffd5a05e0d9656e8a76eac91687072740b06 SHA-256: 7a05f6cd9678482ba7427de56f86fbc34e7ea030a80243c0d58a536170bc2a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or manipulating search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://flygarfield.net/userfiles/file/zaluripasebewukil.pdf In PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/87761899227.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916334592968.pdfIn PDF document text
    • http://greenbrier101.com/userimages/86437132944.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210911_60A782C8D2DB4833.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/70613106550.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/hokfnhaav18mqvj6b1do8b624s/96993030305.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/wogokiwuxigekadivisisomiv.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/lavanunibevomanuk.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/pewafod.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e3a7d3450---jesoboxixatakuvafurumi.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/watovigepinugumuxisusek.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210903161710_2z0tjr.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161371b222ff59---gurumavavuradetuvugilo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138195078b63---tazakejoxoxasiviwuse.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f509f5a097---lekanul.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23123060753.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/bokokotavopapukesofi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613957876ef73---lodobofezofovudi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0vqibp0bg8v779qvplbfgq66od/6597535382.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/89242192747.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/kojaxive.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/8935372131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+walking+dead+season+1+all+episodes+apkPDF 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_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 10664 bytes
SHA-256: 171d12830f3218ed64d82169ec91a119cea8becf8d1cb9548e0c6a5e42a0680f
font_02_sfnt_off000151ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BA 17956 bytes
SHA-256: 371c111463f41517f0d29a86c709bd8012afb231874bb829e2b041ae72473be5

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