Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f407db1e850a45…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 21:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e0538ebd918530e877108bca02dce91 SHA-1: f2e879f35579090cbdb9d8f0705e8357ba7ebc43 SHA-256: 07f407db1e850a45a910c2ace0c5e32dd2b598b7168c8574bc23abe49ecd72d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dangeloremodeling.com/nbloom/fckuploads/file/63482432341.pdf In PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/12202609637.pdfIn PDF document text
    • http://greenld.com/userfiles/latujimexomadiramosega.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f222334e89381fef426af67841e72820/bagubodarejar.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wavinome.pdfIn PDF document text
    • http://vladekoservis.ru/files/15420788919.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/41445628506.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/37565541144.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/77985864559.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/porogepitatevofef.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/90218769978.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/85750681473.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/tubirupisaranosovidi.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0384b7144a0ba07c075326d0fb8df5e5/25266661463.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/53447357353.pdfIn PDF document text
    • http://seamacros.com/upload/file/20816158421.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c4ce33224---76905702396.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/guwawunavibajajuxalini.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/95683448675.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/47490909103.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/56209711037.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/jisokukegewezimizobuwagun.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/binazutaworote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=science+word+that+starts+with+nPDF 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_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 18124 bytes
SHA-256: fdba4ee56c621514d03a186e85c5c3af40a3f19d6249e43c250030cd33566ee8
font_01_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 10580 bytes
SHA-256: 30ccd6384251647e2775766c03b06b72d09cf6750280f4f7f2d49bd2442099ea
font_02_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1