Malicious PDF — malware analysis report

Static analysis result for SHA-256 359ffe55a611b048…

MALICIOUS

PDF

91.6 KB Created: 2021-09-10 14:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 8bf4fcdaaa29868db037b3755e5ac386 SHA-1: f264211d4fc35924820945f8415279014436013b SHA-256: 359ffe55a611b048f50d491d6e349f28feb3355c704c25e288190fd6f69b7761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point to a campaign leveraging link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://biosystech.com/pdsFck/file/33072184819.pdf In PDF document text
    • https://12waktu.com/contents/files/64540834448.pdfIn PDF document text
    • http://kd-council.com/upfile/files/vifowofuretixenewusor.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357bc5337e2---89847219260.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/jemiluruxuditaware.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/redinunamosexuzude.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/gofetisuremopidaba.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/79d43e071d255a3c5a407b89a32a65f8/24495111113.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/pamag.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/zuwefewesoti.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/letasejew.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132914044549---fumibisonimekatajuwaruw.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/95444001800.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/58135440873.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cc3a96af0837d0ce950e46999f6ee07f/ximiw.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/647101602.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/95532764338.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kirukijujubilot.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613724c9d87de---95349624294.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/nenagofujesina.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/jfv28t58p9gvj5513mklqve995/83456994208.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/fitesenirivipam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=saw+7+full+movie+onlinePDF 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_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 17440 bytes
SHA-256: 888e793fed865923cba6622ab9667a0d645b5030c215e800974110a9361cfcc7
font_01_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 10384 bytes
SHA-256: dd67d7deed97bc32b24f7101ca97edf14a5c58845af788524aaa72cd7e87d94a

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