Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e65ebaac6eeaa4f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 14:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c95d8f8f0305e8b22552e30ee7be59d SHA-1: a1f4453e8f1e60b494f2efffed77c30172736950 SHA-256: 4e65ebaac6eeaa4f7414b1a9a0663196e36677623682973cec9abb53dbb32520
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous unknown URLs indicates a strong likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3930141db---50738508309.pdf In PDF document text
    • http://metabolit-plus.ru/files/file/86430881033.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b34bbd7e8781dec07d6455d6e85cb61f/73197724889.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08bc4dc86---61637424356.pdfIn PDF document text
    • http://flexa.cz/docs/file/gitanagukewoz.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/pasabadiridetobutonaro.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/monirekososuvek.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/vijewijezukube.pdfIn PDF document text
    • https://menu2uplus.com/images/file/65339518513.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a15c2351---bizejolifogakonomofujul.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/joruzipazokuluvazumezid.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q7herbuutp4s1nai7aebjcie2o/16684435704.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/navaforefowemamusokeviwi.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/meridedezename.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/32403151304.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8d2fd18bf8968291902e209a5e4441cc/tewumanowogekijeli.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdfIn PDF document text
    • http://jsdarvin.com/files/83567819693.pdfIn PDF document text
    • http://primaneighbors.com/userimages/60483517814.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/bidapesuji.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/59152831251.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/lifeliribapuxoxivata.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/53944702221.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/12933010151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=solving+exponential+equations+worksheetPDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 11196 bytes
SHA-256: f095b8dda7acbacc150a923b7520149d7107f8cbb0a03999eaedaa18b37dcca1
font_02_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 18216 bytes
SHA-256: 49965193d9f1a143a6e8cd53a4c0646b870d339a5e3832b4e1c053f16d2420a5