Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5573c35f9b14bbd…

MALICIOUS

PDF

88.4 KB Created: 2021-07-29 19:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf74713d3dfc31a3ebf6055f1da43da2 SHA-1: 826ac2bd2b9c96ec4f6faea83cff1c0c630f5eaa SHA-256: f5573c35f9b14bbda1d24ce420cb5a4f744a4ffc5f005def415fc5632593ad16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting it's used to distribute further malware or phishing content. The presence of a 'download' button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=how+to+set+up+dymo+labelwriter+400+turbo
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/77ce16098fac6008ccc82f8b91770ef3/kubejepinivefefud.pdf
    • http://dui-antidote.com/images/userfiles/file/12041149186.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9ea32fc98ae2ca3ca9b4cf8cca2f8aa9/wiranipodifujarivuwi.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1pdrggljfvvoejg52ihgbv6jm5/54212204013.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e2db08d6d3a---lekebedefivu.pdf
    • http://biosurfest.com/userfiles/files/vipekeziguremeporeru.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/99e029b388ab3f8cbc565ff07a78fe86/82343061364.pdf
    • https://condominiovillage.com/userfiles/file/35109014143.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8b22a3b9c.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6f0eb5ccea37ec6e73bffa855724c361/tutefere.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8170138c90022ad1770b07ae0baf060e/fuvupimironobesu.pdf
    • http://aimic.com/userfiles/file/87814631219.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6f1b2939---gufinedi.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26a79b297---sesepabojevefenuzeliveda.pdf
    • http://acudrved.com/ckfinder/userfiles/files/31105993145.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb8a9824c---45071919776.pdf
    • http://iccarrentals.com/files/file/wevuge.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/271l9587dm9n2qtf5m4orjnb81/68064306146.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0482fc7cb4---nakarutibat.pdf
    • https://plentis.eu/ckfinder/userfiles/files/lewiwedaguxevuzaderaka.pdf
    • http://www.anclupnapoli.it/userfiles/file/52317195951.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/jisofim.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3bc0e1fd9cd69794fbd0b5c3ca18a554/13411182315.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1catb0phln0stohe5iqprdh7lt/fiwenuwalu.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_off0000eee0.bin
c4c1e5ac42256b61a9436b8aee499ace6d4d504f58226875203e317145f5c5c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 19512 bytes
font_01_sfnt_off0001212d.bin
83cc56c9f62a306854e3501cb577ae828f8974fba5562a5ae90b00fb89f860a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 11080 bytes
font_02_sfnt_off00013add.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 16792 bytes