Malicious PDF — malware analysis report

Static analysis result for SHA-256 225ae8ad63ab193a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 19:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34760181afa732f6a74882e15be34f57 SHA-1: bbb736747425feeb4e549f660d8fa385ad13d859 SHA-256: 225ae8ad63ab193a763eb6bb75133ceb0457c2b89fd38ec7f1fc7620a5521551
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the use of these links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://catamma.ru/uplcv?utm_term=sociology+books+pdf+in+bengali PDF link annotation
    • http://interwork.sk/userfiles/file/36383590811.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfa5ac9f0---wixujek.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/zesepenerojawi.pdfIn PDF document text
    • http://sdes.in/uploads/27002049137.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/51262533757.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/59810912391.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/22531395325.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/24527918066.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ge62oua6kk9bnq13d0r9qvq3ml/27250598111.pdfIn PDF document text
    • https://aashianarealty.com/file/26480648875.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/65486029586.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/68558740693.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/33240269311.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wezotorasitilojedu.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/lonufe.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/zoralumajij.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/93245890731.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0eda06f9bb1a02f57267def750cebef8/41170704637.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f2028716---99378939501.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/38804675659.pdfIn PDF document text
    • http://vizcsap.hu/files/file/92498180175.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/refaxuwivitugowax.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/fobosedevilajevex.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/62cc469a929ff531d9ac75237659827f/90645022107.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000b28f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB28F 16452 bytes
SHA-256: e203dcd6b8d5225eb3647be05e3033377d4d1c40291cbc923550bd501d5f1a56
font_01_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 15696 bytes
SHA-256: 41e69842e40a435802e0546a741011e86269ca8793760b420edb8efcf76b457d
font_03_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 11020 bytes
SHA-256: 2307ed7a72b48de8b2f7bbf049740b5f4a0e0b0f620c85199be6b6d47af6f625

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