Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddd50884a2caab4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-08 01:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 842b25c020b0c72403dd569308724423 SHA-1: 0289cfe365428464dfa606dc533ba014f3d9084b SHA-256: bddd50884a2caab4d993d4a373982f3aad511c8798d22b6f2863fbe8ba9e517d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites or disposable domains. This pattern is commonly used for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://queure.ru/uplcv?utm_term=smart+english+5+student+book+pdf PDF link annotation
    • http://xn--j1aii.su/userfiles/file/muzokopunuwututowovuzi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2crho5uf8sfibvr0i6gkk6js8r/55528784225.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/7848786746.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/50309950144.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/9872236891.pdfIn PDF document text
    • http://runo34.ru/attachments/file/95774775143.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8f8ab131---potij.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9089653c14---goximojitewozu.pdfIn PDF document text
    • https://biocoils.com/img/file/67337700788.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609746ec382a2---zokutisu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihhf3a4n8luujbsaoshhj4bhe3/buvimosugujonoworijivosib.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/79710326772.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/voxikunela.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/fevedopaxejoranul.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sajoxiwiwegabijubi.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/te2c7ge864e9odnjs6q1uq682l/81102655352.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf33193ed---13589440843.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d8e94f63692a02794a8c61a508c129d2/78289357206.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/81112538675.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a25edd0a6---nunine.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5c86afd7937942095e2355be518e6ebe/mirimotiginur.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c497c21e09f---76246580660.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/31757146968.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 11488 bytes
SHA-256: 3964b4f0b2a3d41160e44d6ad2493d32dc33fafe872a08d3b15f7d0e1a7bdae5
font_02_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16696 bytes
SHA-256: 78808fa55355f80104f03283223d8699075a1a40b8db878122d10b5a97421f66
font_03_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 20348 bytes
SHA-256: 475073de3435bc691bfc47303d975a0aa24bc2d2e4cb68d2dbf3a8eb6b36aae7
font_04_sfnt_off00013e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 2232 bytes
SHA-256: b7f8508df8036e76473c710e3f35b391a4be9ba3f2caf03c46ca2c11c2350c48

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