Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dee867e72952b1…

MALICIOUS

PDF

95.6 KB Created: 2021-06-29 15:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 526749d5a7f6e517f7db13da5cf92840 SHA-1: 32231dbaf386c7e1634fc503cce3556633468f74 SHA-256: d8dee867e72952b147b24ec1e5c3ddf51a46e209e42c67fa0e928268a8f4c8d4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to click on these links, potentially leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://semagro-msw.ru/pics/images/file/pedofok.pdf In PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/44584164385.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/50747527047.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/eb810659462d58ab1416c657c812302a/vanezubizos.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210517071352832.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/bimivibibutugewogivu.pdfIn PDF document text
    • http://www.emailposte.com/pictures/likokojepupetojuzolerefo.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/4436446615.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/43673457115.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/34119315212.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/99154504983.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6e49dab8---dapazejobutibiniloxes.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b45ec2e14f6---fepidugerutuf.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077a47857059---fomusokupam.pdfIn PDF document text
    • http://amandamaitland.com/images/file/13891064635.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/xigorufenigasegebepefavib.pdfIn PDF document text
    • http://yuha.be/_files/file/kolosesaxilijubelenug.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79147361c---genapalugaw.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9338f66c06---tefabamadajekefexojav.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/149cddd1f72aa4cc8f479d3729b4bbc3/bizoxiwoluxobifobokesur.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714766a755d---7214860225.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d3a33939---67912441990.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/398a38b737c7dabb51ba834bab621de2/bevakolunesepox.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/n1p05tcv86kh60rfa51r0tm7a7/42479266030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+ghast+tear+in+minecraftPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10908 bytes
SHA-256: 4f7370ea272741d54b2ff92258a36c429bffb6658e5ceb4a2586f1027d8e8809
font_01_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 18392 bytes
SHA-256: ccc43c47dfa6d55d4b32147141bd4d899c6da975ff39ebe208c5b1e8e39e36f4
font_02_sfnt_off000140f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15901 16568 bytes
SHA-256: e104ad048358fb8434075836029b8f2cf308931c25596dd51e9ef0deee18004d

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