Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37c318ae2ebd411…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 23:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 854a7b1c3539b978db3981bc6565a808 SHA-1: 4cf533c7980711e9bae366d33f7b053380b1dfa2 SHA-256: f37c318ae2ebd411734b1d59968a1f8628a192f39900df0d465e68a49a2c2b2b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kidsjeodo.com/images/files/52630006248.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa531478cd---3679215588.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2729ccff6a---34355018510.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/62200551761.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/gapukatupanafewera.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/99403262711.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/37977090622.pdfIn PDF document text
    • https://seikico.net/img-tym/files/598185346.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16079feeda0223---49277720846.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f2b53d16---fekupitasuzojoj.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5adc42a31551dc87552d09edb3a71e49/64127475511.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/60645015547.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6d0c994a0---gapamoda.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109011126187333.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e400c35e60---19033329701.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/96548860842.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/88183731417.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853139577---75871441358.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/zebadexupopadulom.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/novunujofilulojabinut.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/dad7945f4683d90cdb90bc60d1861211/84088094734.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/gasojipedibepitulopuf.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b6d21e8058fa6c8221a787af3be86fd1/6467784997.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9jhn0nma8echl3n0k8cerhqme3/bijivuvejuluvutodegusawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=macroeconomics+books+pdf+freePDF 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_off0000bafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 16260 bytes
SHA-256: 8305b91d54cbcb69de4a5e96a9b5a135d536d96eb13ae6211582ba90fe5acad1
font_01_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 10860 bytes
SHA-256: 34e0213f07042ed3de5b352feb214b84873f1a8991e8cdd1ece4d7b18f8f0048
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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