Malicious PDF — malware analysis report

Static analysis result for SHA-256 164096b0e10805c5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 16:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4e5cf5922ce8b14b7047599687b2eae SHA-1: 6bb4e60eb11f54252d787b9105ff84373b69b805 SHA-256: 164096b0e10805c5c76ea169b15ee0260ca842e14269d2956c0c49cad5c39d5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier assigned a high probability of maliciousness. The document contains a link farm pointing to multiple disposable hosting sites, suggesting an attempt to distribute malware or phish for information. The presence of external URIs and a link farm on compromised CMS upload storage further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://a-metal.e-giant.net/archive/file/files/widatizugironijo.pdf In PDF document text
    • http://unstitchedfootwear.net/files/file/tajexizusulapeta.pdfIn PDF document text
    • http://recviem.ru/img/upload/fewanu.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vevubizakorilanam.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210907212442.pdfIn PDF document text
    • http://www.moyekolodin.com/files/97939431465.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/wajuxusebinosoxidakukazeg.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/64373919074.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/70195a7bae9760cd6fd0a4b5bb5a5dbd/zudanuvotufazopawop.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/87050002967.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c21b87ab9e---16724426192.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210919_3DF521DECCC95D0E.pdfIn PDF document text
    • https://bloc-immo.com/images/diravareveveribumufeka.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/rilopefinagegipadokoxi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ba68dceeff3dadb665bc3eacf6847946/80650619183.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/fifedefakemuvidu.pdfIn PDF document text
    • http://attlas.center/userfiles/file/76639908722.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/ralinesarevew.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/okqda9uhe5l0qs0qn6oqirhbv6/79020163872.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/nabesalivezurofabiwexem.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/vidofi.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/120933236168.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/18038923569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vidmate+app+download+install+new+version+2021PDF 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_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 18016 bytes
SHA-256: 969fba4ef7cf07b9f30ceb40c34fb2eecfce45b5bc24d67accca69fc5e2fa6c4
font_02_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 10968 bytes
SHA-256: 2b53589b3df24bda9df1347daecb2b834a3cdf4366d50e6098c6597b3eba27d0

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