Malicious PDF — malware analysis report

Static analysis result for SHA-256 d302dc99dcfbdcd3…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 10:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c8805f0a47db2228f7fd4b7309e6d14 SHA-1: e1a2b317b25a5de973ef5be0210da3aeda9badfd SHA-256: d302dc99dcfbdcd3870f4e8a60162a8d3f5cd9cc8a093b0acd477089a5c89fd8
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the primary attack vector appears to be the distribution of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=pathophysiology+of+diabetic+nephropathy+pdf PDF link annotation
    • http://tndgdemo2.com/ckfinder/userfiles/files/gevatugafagasikutepawinis.pdfIn PDF document text
    • https://vendax.ro/files/file/vezitojelizatevimalutig.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608096771722e---19081025234.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608686d542262---juninokoluzukasivedesuxuw.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/43612196192.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce23cdc610---totimakoduvizizutunokavug.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3670fa87eb---xowefexexowudagunejujila.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/39923394319.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/94806975905.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8dc2e9f82---xubulik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608124ef8c255---13857243216.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/lugusanadizaw.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/60436831466.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/sulejetisovanefafokub.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1ciri4d5ms0u3jkv0plolse0jk/51218348174.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/rotawuwakewijosukuwej.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/6bb3i6e0jkbpqt6rr3mi4i9r05/833701172.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/kepifinubabesidabelepeduk.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92a177d63---taleda.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/36911054115.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/48748525458.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c797feb0daff1a8f36479f34fb3b0712/24976325019.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/4289314902.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/15608742758.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 18700 bytes
SHA-256: 95dc0d664237d043bb9bcd2331b1dcb940f347e7f21f3e495b12e478ad6921a5
font_01_sfnt_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 11156 bytes
SHA-256: 9a9b37273a3375754eaee703dc9030f683744f515d02d695a2762f200b3a124f
font_02_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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