Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90dff30477ee516…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 08:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1798089f22d017e80c57e5325c511443 SHA-1: 3edbb8a83e50382f0434b9b337fbb366db1bc842 SHA-256: d90dff30477ee516890f1732012e5a282668d24cc276769d73122a172b720e7c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF links suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://keifo.ru/ckfinder/userfiles/files/tomusobixuzema.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/totoarj4hln98vgp3981lgvkq4/resulaxuzekibelolel.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/vubaw.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/lusulimazoduwavulavu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b1caa7dd52544f7205de5f9fcc654a9a/80364244279.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/lavuvikod.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/4416624998.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/bekonirinetunadidimena.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443ce72687a---jodobotezakoxuju.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///vapubuluxuralusegis.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaeb3cfe07---pedarudomelelabuzarimumo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/09lk0smq11uilbov6mpb4bnuae/nupikakagofadogirowesew.pdfIn PDF document text
    • http://healthywithhart.com/res/file/61524818135.pdfIn PDF document text
    • http://landpas.pl/upload/file/54433591828.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/pememogofoxi.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/6283423515.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/wiluki.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/bagaxixoxuzuwivofotakebud.pdfIn PDF document text
    • http://megalaserasia.com/upload///rafeguzozatozanojugup.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139d0d99db---jalatotexixe.pdfIn PDF document text
    • https://edusfera.pl/upload/file/weripapixitebex.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/68750312332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=smile+voice+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d2a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD2A2 17628 bytes
SHA-256: b7da12d9373bc114cd8098d0646e25f542fcb26ddf522b45f79336549f16a253
font_01_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 10296 bytes
SHA-256: 3d611be207339df87c7e9d81cf09c4bd96a1a9aa173a2a069496231f7468612c
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 18500 bytes
SHA-256: a5ae6855a214586ec76785d8e1eb39af7ace91c5043a36d393116d4ea0cb791a
font_03_sfnt_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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