Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d12b8cf5ce1dfb3…

MALICIOUS

PDF

97.0 KB Created: 2021-06-28 01:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4649f257bc9b8875bdbb7c2680c0bf32 SHA-1: c017701d47fa0b992647f133c5c1b9cb0a680af6 SHA-256: 8d12b8cf5ce1dfb3a1d82ecb7d2af3e17920e3774b635cea9c0a67bb1d4d69f9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=my+lower+back+and+stomach+hurts
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0012c1f97---lifudupevolikokonelufaxi.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5ff80f2a---gufenekaxawigofagabonalug.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b14c90a08---8681283978.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/taguwugubonebusalavivopex.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a5beb46c---jonusun.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/23dd80b9c6cdae26c2701cb12c311f6f/bajevafonit.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160afe30bda828---38695934484.pdf
    • https://mszukam.pl/dat//file/35789560427.pdf
    • http://blueyee.com/upload/file/172006496848.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/587df7293d84d74d00951d11b8ce65be/40387436417.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bac44fca814c3dcf04583d1c145b1a65/90007546258.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a9332fd008d---gilevufepibutabo.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085236c7040b---75005768906.pdf
    • http://engineersclasses4competition.com/files/others/rasaseborudew.pdf
    • http://www.aluvascientific.com/UserFiles/file/folunop.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b397f5b37a49284e5955e89503a4ef42/tuxitijad.pdf
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/xilevavanerofefakawife.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c72c2b9e9a8a87d10bd305ca54e43a65/bivapar.pdf
    • http://www.allatpatikapecs.hu/images/file/59152712590.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f8f56b65f232d170eb8d04a76180b70d/dujuxotadixelegeju.pdf
    • https://coebmsf.com/userfiles/file/8802320967.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6u82fks2133m2rvpl54ooqhpta/bisuzovukitovudegufafo.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91c4548c7---62649969901.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/273cc4571e7e9b5ac5c4295c99b131c5/bavovezenuveduwizix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011783.bin
1fc26f3239e255e2cefe63e1f4cb10d0a09ddcc80a95b41078fe05d101eb03aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 17508 bytes
font_01_sfnt_off00014517.bin
8238141f81d4a0adcbc6ca31ea2548635d4e0ba62374d301df0c69b933f8a34f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14517 11068 bytes
font_02_sfnt_off00015ecf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECF 16792 bytes