Malicious PDF — malware analysis report

Static analysis result for SHA-256 1498354ade550762…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 23:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e5f89126688721eb5d0e34ad6ebc30f SHA-1: 9f7b2def8bb0a1eb9cc7a0c79532e57e5e91c589 SHA-256: 1498354ade5507620ec597171e839aaca731d87f538e95cf66d754de0cef6548
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://entone.es/wp-content/plugins/super-forms/uploads/php/files/e7dda1e3a5dc9b35d116dbdecd743869/93174402400.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fvn04a1u7324im7uvb6qnv5mt1/83985870698.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/74708996159.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a039cad8e---43924401438.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609def72431b8---zugakefaserowuperopoxoge.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/lujudume.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160773cb85f42e---35275120608.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b423f2232ca---86547664173.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/85919545081.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/ropekubukezopedidedokil.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5b88a4d4808506b7e9b713049d73f147/zeguzomarivan.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/1304228182.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609958655aaa6---39717694029.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/kumezojabutolazokurozuk.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/kekaxirukupik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51fabde5---83259077739.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5323975c5563b881ae91c6fb54465ea2/69297607512.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/49891944427.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/512628822.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/60568171998.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///68166175028.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/polumidogakulotivosur.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/gemutipowezulo.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/99407107977.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce18fd744f---51185927208.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/24448270635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=functional+and+nonfunctional+testing+pdfPDF 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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16028 bytes
SHA-256: 6df8af0407829414c764072ba2b537d5689f21ae52d4eb4fa9903ea041ce0fcc
font_01_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 10772 bytes
SHA-256: 150aff400414a95f48e29726f63bef5f483bc6613d28b19b17d7569ecf94c734
font_02_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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