Malicious PDF — malware analysis report

Static analysis result for SHA-256 8852dfef985fdfdb…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 04:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34d2bc8b07ef0f51f4f180a9ed909026 SHA-1: dc656658eb6019bf6bd62207b4e86c527dd95ed8 SHA-256: 8852dfef985fdfdb08042ffdefe7d6b67cca5f2220dd3c88872ed834a1d13cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to malicious content through a chain of compromised links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/cbdc2a1cab394c80f22dda798bf38a87/19067936223.pdf In PDF document text
    • http://51-lq.com/userfiles/file///guzafaboxomupenosox.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/94770521938.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/93384540075.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/wikegukubojomomige.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/kujodalik.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c2d79ef55f867c70f6211854afdeda73/sixapeparatameja.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/73911576435.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f23f6661855e0ba999a5e66c7be9bf42/82845250210.pdfIn PDF document text
    • http://nessium.net/userfiles/file/98548482729.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/76026998415.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2a4935c4---tobinujosolujagirekufi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e785188b1---94038602071.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/22122623796.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d27b95667b8a90b06fc671633d141df0/ribugowoboxajobatuvuzirav.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ced79d3c---4522404843.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/5af58ad712f68f4801b0c3336907f5ca/70024814485.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c285bb7130d---devunarugefegatege.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/rixunisezenuwoz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b8dd679b9d1c051736e14cbd30851e8c/67487881303.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085295cce352---subosej.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7lreqeqirrc0ln0a0mjav1kpfr/dizav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bsc+1st+year+zoology+bookPDF 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_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 10720 bytes
SHA-256: 0343963664f70ec03061d46e2121fb620d57bb281e256690464c1cde8637d233
font_01_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 18308 bytes
SHA-256: 4a27ea106e32dabc87b1cfb91bb836865def427cb068a6aac24c4814824a034c

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