Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f39407426a44f5…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 01:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d13ee3df0a8a6c9f07df45d970c0e569 SHA-1: 01ee624829f93c987bf22096f3886c8aa6123c83 SHA-256: f4f39407426a44f540d7bbd8a917dae2ac89a572ab965d78b4a2680746cfa823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host more malicious PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting users through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160754a38699bc---63857187269.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d6342201---73846813593.pdf
    • http://anupbolivia.com/images/files/fuwokajurilekeze.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5080859934956eaad4830a337d824028/zegojovavuwo.pdf
    • http://surtek.biz/image/files/20150121_225845.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7697054a615203ac39cc97f23ac817a0/14735416871.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd446a464f5---wuluzedelebel.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7b4effdb---mizilutegawelemamajanox.pdf
    • https://1877painters.com/FCKeditor/file/1997808913.pdf
    • http://offerseir.com/basefile/offerseircom/files/60331637212.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/77939311422.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0c30a32c---juxarebasata.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b117e001d65---55296012553.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4298dfce0---5236335052.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/29638949379.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3b1d5f4dbe643419b604ca967dcf4153/10830324706.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8be9ef0e403d45eddb1f2a571ea3eff6/xafowinoraramexi.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/728f996eb1913b730e4466c7b8f7d437/nelulobaparap.pdf
    • http://ge-mak.com/files/62554643429.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607163e1d48f5---masetejiw.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/jijubixodemoposopukot.pdf
    • http://kingbikeonline.com/images/upload/File/disuziwupavijatexu.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607687110097c---kexinaduzexibexubik.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d376dfd2a---61969201183.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=famous+pacesetting+leaders
    • 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_off0000e97d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 16792 bytes
font_01_sfnt_off0001018f.bin
02814e5f59a8cf2443d9120a369fa1dbb70998b085cad44a7613d16cb763b8e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 16252 bytes
font_02_sfnt_off00012b86.bin
2ba0b677ac1d0515198e3b29d42de67731fb79a8e91da699018246b16007cce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10936 bytes

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