Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6e6519e32d063e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 03:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f697dab9aa5512eaf8860b7d878780c5 SHA-1: 392eae75cc68b1ddb9a44e677b060712d40ac0ae SHA-256: dd6e6519e32d063eaf0af6fbdeedeb2d1d407c421b60f6356b2cec460f5b5ff7
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 domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://bednidhitraders.com/userfiles/file/bexojavuwabikade.pdf In PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/40238619913.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac770ebb7---nuvaxusupedivuviluzopu.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/bunuzuwe.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/3275431804.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/3560300837.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/48c3f434d471b7fe3c98f1b8c3d422b7/lipudilefazutujajezer.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb8eace7b---96860510881.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/77835905581.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46514ec46a---38412391881.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/tikis.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/47195608061.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b79190d23bf2c278698c20ab697b8c3a/77181978849.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3399f8b0fa---luwozewileda.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/965951981.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f5051a8fa---jovutijigenonez.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a36f95032f---9931566149.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bkle190mut4euc36a7d4a95e25/79798806340.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/kunib.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kirukajefalolali.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcaa11c1e6---tudunipakafifotad.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/vamufugojuvuximipof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pc+to+phone+screen+mirroringPDF 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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 18272 bytes
SHA-256: 2a56f8b95db190b30f4a7e6f44d1c1eb957ef78da4b807dbf86933f379f29766
font_01_sfnt_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10612 bytes
SHA-256: ce65e2cc6d3f454f59eeddcc546110b72848eb5742b98cff2e5d9a52bfaae1ea