Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92ee4333a73333c…

MALICIOUS

PDF

79.4 KB Created: 2021-08-27 02:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b53a81f8444f7311fe58353924e85ff SHA-1: 7200e3339400f2105a97d4a71d38232cbe9f2617 SHA-256: b92ee4333a73333c90c5bba4e83b4d862b0efb8058aba7eaa7123f8970bd285d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to leverage these links for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607142f8e3583---bibir.pdf In PDF document text
    • https://mcsfood.com/images/file/61304830890.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85d5bfb0b---luxexizuwudibil.pdfIn PDF document text
    • https://aaaxxion.info/images/file/43932075650.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/63944774357.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/76597769927.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1808549a---tojonamokipunevosor.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2b31dff94ac2d65052be7c458325d26/bavesifigupawifuwon.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/fedigenuzadotunuxa.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/i1p4jph8dnda3a23grkonns8se/40694269823.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160780615efb41---75255412444.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/762931e06f48160dad098f5a16c48f54/mozotujenajor.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/41611815991.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e6918396975e3fb035db96e72489f5bc/tarowumutigifax.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/47353940392.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774b33c4a8---67093290502.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/78984456871.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612497120237e---46345355133.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6ca250e7f80878c3e4cdc26eea861625/wukesoboguxijawugumifid.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/mokabemoj.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/44610620721.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-12/20210612201453450630.pdfIn PDF document text
    • http://fournitures-reliure.com/prod_files/sibijesujilusa.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/luvokafefamokapik.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/51380780078.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/8at0gstgkvqj4tld85sl3gmtut/25445351071.pdfIn PDF document text
    • http://huiking.cn/uploads/file/121308037764.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/c0fa9f0b0685185d368886d9b9f02cdc/88587602739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+main+purpose+of+mitosisPDF 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_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 15336 bytes
SHA-256: 2eaa4ba374b78cac8512098b9a17dd38ace2464ae5d24475b03aea57b06799b8
font_01_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 10672 bytes
SHA-256: 377fe823684080aaf63b0ee51cf41fb72a87977017cd7e1ea525bc34a55bd332