Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb879177459b87c1…

MALICIOUS

PDF

89.5 KB Created: 2021-08-08 18:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 153966afe314bbad530123f4e4e33850 SHA-1: 384307c4208e39b31cb0d0a73e84d3a7232381d1 SHA-256: bb879177459b87c1138b0c39159d46455102993a995daee1aae7e5d4eb73164f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://almondzwealth.com/administrator/imagetemp/file/gikidesonipisav.pdf In PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/wuladesilorukorisoxeb.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fec7bb27929125d945d8b3fbfbeabb2b/5927940585.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/bogawemavibanirobule.pdfIn PDF document text
    • https://luminex.pl/upload/file/48716993056.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abdad243486---rerenepaxasetowikel.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/8359833416.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085383c530ec---junawataxo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847f66300f---10034701261.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/da28b66ed6b09ed34f32d652dd625171/repaweduxanizasikaki.pdfIn PDF document text
    • https://jss-moms.si/upload/File/zuwodovezugukawasu.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/rodijixerirefarida.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/81216878205.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/86889946203.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/risomugomafewivukelu.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210729_230610.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/deef0883a44f4db5b075fc4afefdb00f/zitemiledafamugima.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e4d8c6034b8e3fadbcfb15169af49be5/fevub.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/visugivawisokutemat.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dc3bc345c---rudijunixiwalot.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/9731072828.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/23286888734.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b95f594ba41218acd8351b492dc74922/virifigogonurok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=parabola+con+vertice+fuera+del+origen+y+focoPDF 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_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 18912 bytes
SHA-256: 6caee40fcca8dbb8e6aad95626c15e7a16131331e6ddc485be034b383f7ae436
font_01_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 10904 bytes
SHA-256: 6591cf4de38cdcb43d3fc8c41730506a4fc96517f8bfa693a69e4f2842fec9c8
font_02_sfnt_off00013e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1