Malicious PDF — malware analysis report

Static analysis result for SHA-256 286e4b01e98c36be…

MALICIOUS

PDF

97.0 KB Created: 2021-07-06 21:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 642db19e06f8f2917b7b39e349a6e795 SHA-1: 65b09253261c4089b7778fb41368b2ad1091a080 SHA-256: 286e4b01e98c36bebbf58b5699b9c42f0184d025c75e80f94298c20da9e9c116
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089749b33e0e---87988484317.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/33d14ff1328062ff1daf605f9497bf5a/46327903379.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bfebd3a92db---koludasok.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/pirilumevemutipubiw.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21584d76f---59191270835.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/naluxunatepese.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6c0bcf008---wosupowagovunewifo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a993f64d5c---42721736260.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd1aa01f5a---wajixumawisofojeri.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/94093925868.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f66d90da2---60770656953.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/185c6gjd4va416dd4vcaui17h0/42937379938.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/10603653698.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/larorelixuvidelaz.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/sofesowajepuzorezori.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/93437747344.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/83099cdf4720f8d6870eb1179ab4d360/mefopexulikuwe.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/62329566748.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/8666216327.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9e0423a52051f8c0310286e27abff396/87779656912.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a3f2a61e---2731738641.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/32989828984.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/26551343773.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ca3b3252d0446ac7089bdbe1fc5d5a0f/87884605987.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/tuvogomewojowolijos.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/konoxiwapuworitowalapuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=writing+an+sop+for+mastersPDF 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_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 16888 bytes
SHA-256: 1fac4317ed013dffe4c5eee601c1c25dc53d9dab559a0f7ee082fd5fd12d7b90
font_01_sfnt_off0001449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 10648 bytes
SHA-256: 7a90d1853305e7950d1e8eec776a918b677f78d030761288f2294ecf2e90bcb0
font_02_sfnt_off00015d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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