Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d79897df1f8052…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 06:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11cf4f13d9a44a847a420f621679406e SHA-1: db12d9e0a130401a8800c556fcaa59cc60091a86 SHA-256: 27d79897df1f8052795b5091ebc38ad583b7fba87138f7ccd552cc3add85d6cb
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 are part of link farms designed to obscure the final destination. ClamAV and an ML classifier identified the PDF as malicious, specifically flagging it as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://www.hermosabeachbungalows.com/userfiles/files/73894487783.pdf In PDF document text
    • https://inks.bg/userfiles/file/9208193310.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/52715405065.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d1592b28025b32343de0b7724e9ac77f/42428602571.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/zasugopuge.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/2052348555.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/44929219063.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f5ba3300---51977719612.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/wivudomix.pdfIn PDF document text
    • https://istanajp.net/contents/files/16663841861.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/rowadotelux.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/90138691796.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/mokijude.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/mogufapogubopom.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/jinugumitenaxifegifete.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/88555140119.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/95082783122.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/21835044126.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/lisuxofotenu.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/39277098189.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb96798012---fanimenatojepeda.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bovefusida.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136959b8d8ff---sokiru.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/29112787293.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/682f0d36c32800f26ebbd430ca64509b/491402661.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ris75bdeddmaorjdcg0kh5tqd4/24849042711.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210902142155.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/70801293347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=configure+hotmail+on+androidPDF 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_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 10764 bytes
SHA-256: 86c418962edc91fdf12b7cd45050f81624e459cbd04210fb6dd50127895190b5
font_02_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 17784 bytes
SHA-256: 170d52d80f12c3eac84f68dd76e41d60bba51c832275c738f1e63e8a71d9018e

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