Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a2c3962b3ea023…

MALICIOUS

PDF

81.5 KB Created: 2021-10-05 12:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 60f6289fecc225c198c27c2daf2ad7ee SHA-1: 9b5c9f4426e3f95333f468cde8cea51e7a3648e2 SHA-256: 16a2c3962b3ea0234ef778d57bd689b96de5090a6971f402b51fbf649e438c6b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically calls out compromised WordPress uploads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16158496dcf129---papitonevudekevuj.pdf In PDF document text
    • http://bannhuaduong.net/upload/files/58873347304.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/80386731759.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/32066436188.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/tekijogezutok.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/roregivipepam.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/ponutituvazigosamiboju.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/66401778434.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138900cced92---17651704959.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161426f6678e2d---tavomaw.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-7/20210907064436300719.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/66503766281.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/durajoridaviwumef.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/pinupigupujaxodun.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/46339780658.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/mosezotirinarorikebezip.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/zelunefenonelivaw.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/15354613793.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/29cfae36b2ca8455ded56e60fe810673/zizesujevedutoputiworero.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/28372725290.pdfIn PDF document text
    • https://gozdekadife.com/resimler/files/gusesojazoneti.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/bibukefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=plants+prepare+food+by+the+process+ofPDF 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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 18556 bytes
SHA-256: 8e8aa0b51f23404261f87b017e5e95020472b243387adacc01a2984b6c6693b4
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 10880 bytes
SHA-256: 70ce8b2f769099d1597d13f25b3d813c5b4e1c787b37e09956499b2d93c5d8cc
font_02_sfnt_off0001207b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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