Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5c13cceb77d8db…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 02:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae40b4eebbd9972043cf962c7a105fbc SHA-1: f5efb33a3ed7f46f4e82318ca5160b6007d024ed SHA-256: 8b5c13cceb77d8dba5185c0c00c88664a29b0ce57db88b5f0b3233997cd73a6e
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sunil.kr/uploadfile/fckeditor/file/50343043164.pdf In PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/kodexafe.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/56084748051.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/87885229903.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/311851432177.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/88080925425.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/76623ba3907da9d9d44419ef2f6e24b0/sarawevuwupajev.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/68706534503.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fecd17343---zizuziguzaxowunepe.pdfIn PDF document text
    • https://tadimtursu.com/image/files/xiragotexolano.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5du015qfnqss45ntt551c8nodo/89951884876.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cff59b57a---detijipegamomesajug.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/70cb5bf01fb7989692ae72ec5682cb0f/57372329524.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/vuxibuxibilubi.pdfIn PDF document text
    • https://istanajp2.com/contents/files/54872573026.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/pozatesabodupaveni.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/sibuk.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/87941903451.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/zupofiguxilorapivolemanek.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/afbb774c0cfbc7c46c6051191e45918c/mopinu.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/79280451651.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/65083197369.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f5714b45960439a013653dc07bc356c5/7112960222.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/09020cd69480cfc21b7b64bacb1a8c4b/14685573689.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46bea4ede9---xadopaxoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=interview+questions+and+answers+on+transformersPDF 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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 10820 bytes
SHA-256: add1f72d42701dbdf7f62a76cb1df3dc86b4caab60ec930b8fdfa63ce0a5bb19
font_02_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 17452 bytes
SHA-256: 10376737e52e34e838e055c46e0a32ceb2c232c8b46d5999a7677ff0a61c292b

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