Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86ffc86f31d4d5e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 08:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a34f3a49511b62b96373d5904b63ada SHA-1: f51e1b057e63a17d1fa75336a36d212a92ac7512 SHA-256: a86ffc86f31d4d5e2b7c4817009238fd2c14e6b95aedf6fb1475f7e644c7a9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ctcitsupport.com/media/files/33148372678.pdf In PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/setejawo.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/79612278321.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/jewiwowosatemalozogonev.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/ralefugivemawanidezutofij.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/13130327765.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/dinulinijona.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5f534c18d8ad02dffc1cc21fff552811/35078254247.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76547217595.pdfIn PDF document text
    • http://indemo.pl/Image/files/77523170620.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631803551.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/puvilomewexalax.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/fesexaxomufularevov.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210903052513.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/butufaxaronim.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210919074302895549tadll.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8065l5dvle7etg90pgjnsab037/95031221359.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6ddbe978---kagejokosoj.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/98891284043.pdfIn PDF document text
    • http://nscenter.cn/upload/files/dosigugukimidoraritevu.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/kazifafoderujijotexibef.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b4490086bc97629d30fb2e20f8a813c3/jabemotamomasetatexuka.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-2/20210902072914752264.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/33028901015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+download+kingroot+apkPDF 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_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 17748 bytes
SHA-256: 435b5e0b097e339b7f74ed7e0d628fbd2a0ca3e5fbf16ef1b1528b6e8aff8e4a
font_02_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 10556 bytes
SHA-256: 14e72bee3537e0526e146fb122090c9a12b484ff0edaa59581d3558410c9d9b7

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