Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b531460af8161a0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 08:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d9ea0092853ba872b05dc85ec0ea1fc SHA-1: d4312f7e02385104750e4711493becd2ee0b61d7 SHA-256: 6b531460af8161a03a4f3da1159207d4759d8fbb72481d932244ef22915f61f2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://theffirm.com/userfiles/file/tulepexawudajafenas.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bed8c6e4b---xekebiporipusibila.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/gikevatapegofosazi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/3362710651.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57amolut5j1nds9pg5voucpagm/tetimadesu.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/66150575910.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/degubisos.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/43653325532.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-6/20210906034832518531.pdfIn PDF document text
    • https://5udua.com/contents/files/borogibixin.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/7508084000.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-10-08-47-25-98.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/nukufifapubibo.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/28481900816.pdfIn PDF document text
    • https://ubranni.com/uploader/files/fibevukekumakajuzanamor.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/jakilatasudirabovivifexo.pdfIn PDF document text
    • https://hse.tw/upload/file/jazuxemunale.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/muwowesijepilasadesevi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac565ff64---gedisufodovev.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/dotadekux.pdfIn PDF document text
    • http://asja.ua/userfiles/file/26512595875.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/ruzebinapobika.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/29381442866.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bebe1bd57c---fufasiligimumepugoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=whatsapp+plus+download+for+android+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_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 19732 bytes
SHA-256: ecda8c6e9c12538ad6c0384aa7ab81a14c4ff99d296812093efff7a0b846aca5
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 10736 bytes
SHA-256: 1a26be220d38a54deaee20ae635055ce01c71eab79887ee26744db8f547738f2

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